Release v0.16.2

Restrict readelf usage to Linux only #602
Provide a default lib location when detecting C++11 ABI
2026-02-04 13:46:19 +01:00 · 2016-10-22 18:39:33 +01:00 · 2016-10-14 16:07:17 +01:00 · 2016-10-13 12:38:53 +01:00 · 2016-10-13 10:53:38 +01:00 · 2016-10-12 19:41:49 +01:00
143 changed files with 3699 additions and 1328 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -4,8 +4,13 @@ coverage
 test/bench/node_modules
 test/fixtures/output*
 test/leak/libvips.supp
+test/saliency/report.json
+test/saliency/Image*
+test/saliency/[Uu]serData*
+!test/saliency/userData.js
 lib
 include
 packaging/libvips*
 packaging/*.log
+!packaging/build
 .DS_Store
--- a/.jshintignore
+++ b/.jshintignore
@@ -1,3 +1,4 @@
 node_modules
 test/bench/node_modules
+test/saliency/humanae/node_modules
 coverage
--- a/.jshintrc
+++ b/.jshintrc
@@ -2,7 +2,7 @@
  "strict": true,
  "node": true,
  "maxparams": 4,
-  "maxcomplexity": 13,
+  "maxcomplexity": 14,
  "globals": {
    "beforeEach": true,
    "afterEach": true,
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,6 @@ node_js:
  - "0.10"
  - "0.12"
  - "4"
-  - "5"
  - "6"
 os:
  - linux
@@ -15,9 +14,8 @@ addons:
    - ubuntu-toolchain-r-test
    packages:
    - g++-4.8
-osx_image: xcode7.3
+osx_image: xcode8
 before_install:
  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then export CXX=g++-4.8; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install homebrew/science/vips; fi
 after_success:
  - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -43,6 +43,7 @@ Any change that modifies the existing public API should be added to the relevant
 | ------: | :--------- |
 | v0.16.0 | pencil     |
 | v0.17.0 | quill      |
+| v0.18.0 | ridge      |

 Please squash your changes into a single commit using a command like `git rebase -i upstream/<wip-branch>`.

--- a/README.md
+++ b/README.md
@@ -1,5 +1,9 @@
 # sharp

+```sh
+npm install sharp
+```
+
 The typical use case for this high speed Node.js module
 is to convert large images in common formats to
 smaller, web-friendly JPEG, PNG and WebP images of varying dimensions.
@@ -13,11 +17,45 @@ Lanczos resampling ensures quality is not sacrificed for speed.
 As well as image resizing, operations such as
 rotation, extraction, compositing and gamma correction are available.

-Most Windows (x64), Linux and ARMv6+ systems do not require
+OS X, Windows (x64), Linux (x64, ARM) systems do not require
 the installation of any external runtime dependencies.

-Use with OS X is as simple as running `brew install homebrew/science/vips`
-to install the libvips dependency.
+## Examples
+
+```javascript
+import sharp from 'sharp';
+```
+
+```javascript
+sharp(inputBuffer)
+  .resize(320, 240)
+  .toFile('output.webp', (err, info) => ... );
+```
+
+```javascript
+sharp('input.jpg')
+  .rotate()
+  .resize(200)
+  .toBuffer()
+  .then( data => ... )
+  .catch( err => ... );
+```
+
+```javascript
+const roundedCorners = new Buffer(
+  '<svg><rect x="0" y="0" width="200" height="200" rx="50" ry="50"/></svg>'
+);
+
+const roundedCornerResizer =
+  sharp()
+    .resize(200, 200)
+    .overlayWith(roundedCorners, { cutout: true })
+    .png();
+
+readableStream
+  .pipe(roundedCornerResizer)
+  .pipe(writableStream);
+```

 [![Test Coverage](https://coveralls.io/repos/lovell/sharp/badge.png?branch=master)](https://coveralls.io/r/lovell/sharp?branch=master)

--- a/appveyor.yml
+++ b/appveyor.yml
@@ -7,10 +7,10 @@ environment:
  matrix:
  - nodejs_version: "0.12"
  - nodejs_version: "4"
-  - nodejs_version: "5"
  - nodejs_version: "6"
 install:
  - ps: Install-Product node $env:nodejs_version x64
+  - npm install -g npm@latest
  - npm install
 test_script:
  - npm run-script test-win
--- a/binding.gyp
+++ b/binding.gyp
@@ -18,14 +18,14 @@
          'src/libvips/cplusplus/VImage.cpp'
        ],
        'include_dirs': [
-          '<(module_root_dir)/include',
-          '<(module_root_dir)/include/glib-2.0',
-          '<(module_root_dir)/lib/glib-2.0/include'
+          'include',
+          'include/glib-2.0',
+          'lib/glib-2.0/include'
        ],
        'libraries': [
-          '<(module_root_dir)/lib/libvips.lib',
-          '<(module_root_dir)/lib/libglib-2.0.lib',
-          '<(module_root_dir)/lib/libgobject-2.0.lib'
+          '../lib/libvips.lib',
+          '../lib/libglib-2.0.lib',
+          '../lib/libgobject-2.0.lib'
        ],
        'configurations': {
          'Release': {
@@ -91,10 +91,6 @@
      'src/sharp.cc',
      'src/utilities.cc'
    ],
-    'defines': [
-      '_GLIBCXX_USE_CXX11_ABI=0',
-      '_ALLOW_KEYWORD_MACROS'
-    ],
    'include_dirs': [
      '<!(node -e "require(\'nan\')")'
    ],
@@ -107,62 +103,86 @@
            'libraries': ['<!@(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --libs --static vips-cpp)']
          }, {
            'libraries': ['<!@(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --libs vips-cpp)']
+          }],
+          ['OS == "linux"', {
+            'defines': [
+              # Inspect libvips-cpp.so to determine which C++11 ABI version was used and set _GLIBCXX_USE_CXX11_ABI accordingly. This is quite horrible.
+              '_GLIBCXX_USE_CXX11_ABI=<!(if readelf -Ws "$(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --libs-only-L vips-cpp | cut -c 3- | sed -e "s/^$/\/usr\/lib/")/libvips-cpp.so" | c++filt | grep -qF __cxx11;then echo "1";else echo "0";fi)'
+            ]
          }]
        ]
      }, {
        # Attempt to download pre-built libvips and install locally within node_modules
        'include_dirs': [
-          '<(module_root_dir)/include',
-          '<(module_root_dir)/include/glib-2.0',
-          '<(module_root_dir)/lib/glib-2.0/include'
+          'include',
+          'include/glib-2.0',
+          'lib/glib-2.0/include'
        ],
        'conditions': [
          ['OS == "win"', {
+            'defines': [
+              '_ALLOW_KEYWORD_MACROS'
+            ],
            'libraries': [
-              '<(module_root_dir)/lib/libvips.lib',
-              '<(module_root_dir)/lib/libglib-2.0.lib',
-              '<(module_root_dir)/lib/libgobject-2.0.lib'
+              '../lib/libvips.lib',
+              '../lib/libglib-2.0.lib',
+              '../lib/libgobject-2.0.lib'
+            ]
+          }],
+          ['OS == "mac"', {
+            'variables': {
+              'download_vips': '<!(node -e "require(\'./binding\').download_vips()")'
+            },
+            'libraries': [
+              '../lib/libvips-cpp.42.dylib',
+              '../lib/libvips.42.dylib',
+              '../lib/libglib-2.0.0.dylib',
+              '../lib/libgobject-2.0.0.dylib',
+              # Ensure runtime linking is relative to sharp.node
+              '-rpath \'@loader_path/../../lib\''
            ]
          }],
          ['OS == "linux"', {
            'variables': {
              'download_vips': '<!(LDD_VERSION="<!(ldd --version 2>&1 || true)" node -e "require(\'./binding\').download_vips()")'
            },
+            'defines': [
+              '_GLIBCXX_USE_CXX11_ABI=0'
+            ],
            'libraries': [
-              '<(module_root_dir)/lib/libvips-cpp.so',
-              '<(module_root_dir)/lib/libvips.so',
-              '<(module_root_dir)/lib/libglib-2.0.so',
-              '<(module_root_dir)/lib/libgobject-2.0.so',
+              '../lib/libvips-cpp.so',
+              '../lib/libvips.so',
+              '../lib/libglib-2.0.so',
+              '../lib/libgobject-2.0.so',
              # Dependencies of dependencies, included for openSUSE support
-              '<(module_root_dir)/lib/libcairo.so',
-              '<(module_root_dir)/lib/libcroco-0.6.so',
-              '<(module_root_dir)/lib/libexif.so',
-              '<(module_root_dir)/lib/libffi.so',
-              '<(module_root_dir)/lib/libfontconfig.so',
-              '<(module_root_dir)/lib/libfreetype.so',
-              '<(module_root_dir)/lib/libgdk_pixbuf-2.0.so',
-              '<(module_root_dir)/lib/libgif.so',
-              '<(module_root_dir)/lib/libgio-2.0.so',
-              '<(module_root_dir)/lib/libgmodule-2.0.so',
-              '<(module_root_dir)/lib/libgsf-1.so',
-              '<(module_root_dir)/lib/libgthread-2.0.so',
-              '<(module_root_dir)/lib/libharfbuzz.so',
-              '<(module_root_dir)/lib/libjpeg.so',
-              '<(module_root_dir)/lib/liblcms2.so',
-              '<(module_root_dir)/lib/liborc-0.4.so',
-              '<(module_root_dir)/lib/libpango-1.0.so',
-              '<(module_root_dir)/lib/libpangocairo-1.0.so',
-              '<(module_root_dir)/lib/libpangoft2-1.0.so',
-              '<(module_root_dir)/lib/libpixman-1.so',
-              '<(module_root_dir)/lib/libpng.so',
-              '<(module_root_dir)/lib/libpng16.so',
-              '<(module_root_dir)/lib/librsvg-2.so',
-              '<(module_root_dir)/lib/libtiff.so',
-              '<(module_root_dir)/lib/libwebp.so',
-              '<(module_root_dir)/lib/libxml2.so',
-              '<(module_root_dir)/lib/libz.so',
+              '../lib/libcairo.so',
+              '../lib/libcroco-0.6.so',
+              '../lib/libexif.so',
+              '../lib/libffi.so',
+              '../lib/libfontconfig.so',
+              '../lib/libfreetype.so',
+              '../lib/libgdk_pixbuf-2.0.so',
+              '../lib/libgif.so',
+              '../lib/libgio-2.0.so',
+              '../lib/libgmodule-2.0.so',
+              '../lib/libgsf-1.so',
+              '../lib/libgthread-2.0.so',
+              '../lib/libharfbuzz.so',
+              '../lib/libjpeg.so',
+              '../lib/liblcms2.so',
+              '../lib/liborc-0.4.so',
+              '../lib/libpango-1.0.so',
+              '../lib/libpangocairo-1.0.so',
+              '../lib/libpangoft2-1.0.so',
+              '../lib/libpixman-1.so',
+              '../lib/libpng.so',
+              '../lib/librsvg-2.so',
+              '../lib/libtiff.so',
+              '../lib/libwebp.so',
+              '../lib/libxml2.so',
+              '../lib/libz.so',
              # Ensure runtime linking is relative to sharp.node
-              '-Wl,-rpath=\'$${ORIGIN}/../../lib\''
+              '-Wl,--disable-new-dtags -Wl,-rpath=\'$${ORIGIN}/../../lib\''
            ]
          }]
        ]
@@ -208,46 +228,48 @@
      ['OS == "win"', {
        # Windows lacks support for rpath
        'copies': [{
-          'destination': '<(module_root_dir)/build/Release',
+          'destination': 'build/Release',
          'files': [
-            '<(module_root_dir)/lib/GNU.Gettext.dll',
-            '<(module_root_dir)/lib/libasprintf-0.dll',
-            '<(module_root_dir)/lib/libcairo-2.dll',
-            '<(module_root_dir)/lib/libcairo-gobject-2.dll',
-            '<(module_root_dir)/lib/libcairo-script-interpreter-2.dll',
-            '<(module_root_dir)/lib/libcroco-0.6-3.dll',
-            '<(module_root_dir)/lib/libexif-12.dll',
-            '<(module_root_dir)/lib/libexpat-1.dll',
-            '<(module_root_dir)/lib/libffi-6.dll',
-            '<(module_root_dir)/lib/libfftw3-3.dll',
-            '<(module_root_dir)/lib/libfontconfig-1.dll',
-            '<(module_root_dir)/lib/libfreetype-6.dll',
-            '<(module_root_dir)/lib/libgcc_s_seh-1.dll',
-            '<(module_root_dir)/lib/libgdk_pixbuf-2.0-0.dll',
-            '<(module_root_dir)/lib/libgif-4.dll',
-            '<(module_root_dir)/lib/libgio-2.0-0.dll',
-            '<(module_root_dir)/lib/libglib-2.0-0.dll',
-            '<(module_root_dir)/lib/libgmodule-2.0-0.dll',
-            '<(module_root_dir)/lib/libgobject-2.0-0.dll',
-            '<(module_root_dir)/lib/libgsf-1-114.dll',
-            '<(module_root_dir)/lib/libgthread-2.0-0.dll',
-            '<(module_root_dir)/lib/libintl-8.dll',
-            '<(module_root_dir)/lib/libjpeg-62.dll',
-            '<(module_root_dir)/lib/liblcms2-2.dll',
-            '<(module_root_dir)/lib/libpango-1.0-0.dll',
-            '<(module_root_dir)/lib/libpangocairo-1.0-0.dll',
-            '<(module_root_dir)/lib/libpangowin32-1.0-0.dll',
-            '<(module_root_dir)/lib/libpixman-1-0.dll',
-            '<(module_root_dir)/lib/libpng16-16.dll',
-            '<(module_root_dir)/lib/libquadmath-0.dll',
-            '<(module_root_dir)/lib/librsvg-2-2.dll',
-            '<(module_root_dir)/lib/libssp-0.dll',
-            '<(module_root_dir)/lib/libstdc++-6.dll',
-            '<(module_root_dir)/lib/libtiff-5.dll',
-            '<(module_root_dir)/lib/libvips-42.dll',
-            '<(module_root_dir)/lib/libwebp-6.dll',
-            '<(module_root_dir)/lib/libxml2-2.dll',
-            '<(module_root_dir)/lib/zlib1.dll'
+            'lib/GNU.Gettext.dll',
+            'lib/libasprintf-0.dll',
+            'lib/libcairo-2.dll',
+            'lib/libcairo-gobject-2.dll',
+            'lib/libcairo-script-interpreter-2.dll',
+            'lib/libcharset-1.dll',
+            'lib/libcroco-0.6-3.dll',
+            'lib/libexif-12.dll',
+            'lib/libexpat-1.dll',
+            'lib/libffi-6.dll',
+            'lib/libfftw3-3.dll',
+            'lib/libfontconfig-1.dll',
+            'lib/libfreetype-6.dll',
+            'lib/libgcc_s_seh-1.dll',
+            'lib/libgdk_pixbuf-2.0-0.dll',
+            'lib/libgif-7.dll',
+            'lib/libgio-2.0-0.dll',
+            'lib/libglib-2.0-0.dll',
+            'lib/libgmodule-2.0-0.dll',
+            'lib/libgobject-2.0-0.dll',
+            'lib/libgsf-1-114.dll',
+            'lib/libgthread-2.0-0.dll',
+            'lib/libiconv-2.dll',
+            'lib/libintl-8.dll',
+            'lib/libjpeg-62.dll',
+            'lib/liblcms2-2.dll',
+            'lib/libpango-1.0-0.dll',
+            'lib/libpangocairo-1.0-0.dll',
+            'lib/libpangowin32-1.0-0.dll',
+            'lib/libpixman-1-0.dll',
+            'lib/libpng16-16.dll',
+            'lib/libquadmath-0.dll',
+            'lib/librsvg-2-2.dll',
+            'lib/libssp-0.dll',
+            'lib/libstdc++-6.dll',
+            'lib/libtiff-5.dll',
+            'lib/libvips-42.dll',
+            'lib/libwebp-6.dll',
+            'lib/libxml2-2.dll',
+            'lib/zlib1.dll'
          ]
        }]
      }]
--- a/binding.js
+++ b/binding.js
@@ -17,6 +17,16 @@ var minimumLibvipsVersion = process.env.npm_package_config_libvips || require('.

 var vipsHeaderPath = path.join(__dirname, 'include', 'vips', 'vips.h');

+var platform = process.env.npm_config_platform || process.platform;
+
+var arch = process.env.npm_config_arch || process.arch;
+var arm_version = process.env.npm_config_armv || process.config.variables.arm_version;
+
+if (arch === 'arch64' || arch === 'armhf') {
+  arch = 'arm';
+  if (arch === 'arch64') arm_version = '8';
+}
+
 // -- Helpers

 // Does this file exist?
@@ -46,6 +56,24 @@ var unpack = function(tarPath, done) {
    .pipe(extractor);
 };

+var platformId = function() {
+  var id = [platform, arch].join('-');
+  if (arch === 'arm') {
+    switch(arm_version) {
+      case '8':
+        id = id + 'v8';
+        break;
+      case '7':
+        id = id + 'v7';
+        break;
+      default:
+        id = id + 'v6';
+        break;
+    }
+  }
+  return id;
+};
+
 // Error
 var error = function(msg) {
  if (msg instanceof Error) {
@@ -61,7 +89,7 @@ module.exports.download_vips = function() {
  // Has vips been installed locally?
  if (!isFile(vipsHeaderPath)) {
    // Ensure Intel 64-bit or ARM
-    if (process.arch === 'ia32') {
+    if (arch === 'ia32') {
      error('Intel Architecture 32-bit systems require manual installation - please see http://sharp.dimens.io/en/stable/install/');
    }
    // Ensure glibc >= 2.15
@@ -77,8 +105,7 @@ module.exports.download_vips = function() {
      }
    }
    // Arch/platform-specific .tar.gz
-    var platform = (process.arch === 'arm') ? 'arm' : process.platform.substr(0, 3);
-    var tarFilename = ['libvips', minimumLibvipsVersion, platform].join('-') + '.tar.gz';
+    var tarFilename = ['libvips', minimumLibvipsVersion, platformId()].join('-') + '.tar.gz';
    var tarPath = path.join(__dirname, 'packaging', tarFilename);
    if (isFile(tarPath)) {
      unpack(tarPath);
@@ -120,15 +147,5 @@ module.exports.use_global_vips = function() {
      minimumLibvipsVersion
    );
  }
-  if (process.platform === 'darwin' && !useGlobalVips) {
-    if (globalVipsVersion) {
-      error(
-        'Found libvips ' + globalVipsVersion + ' but require ' + minimumLibvipsVersion +
-        '\nPlease upgrade libvips by running: brew update && brew upgrade'
-      );
-    } else {
-      error('Please install libvips by running: brew install homebrew/science/vips --with-webp --with-graphicsmagick');
-    }
-  }
  process.stdout.write(useGlobalVips ? 'true' : 'false');
 };
--- a/circle.yml
+++ b/circle.yml
@@ -3,4 +3,4 @@ machine:
    - docker
 test:
  override:
-    - ./packaging/test.sh
+    - ./packaging/test-linux-x64.sh
--- a/docs/api.md
+++ b/docs/api.md
@@ -60,7 +60,7 @@ Fast access to image metadata without decoding any compressed image data.
 * `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`
 * `width`: Number of pixels wide
 * `height`: Number of pixels high
-* `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `scrgb`, `cmyk`, `lab`, `xyz`, `b-w` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L522)
+* `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `scrgb`, `cmyk`, `lab`, `xyz`, `b-w` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L568)
 * `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK
 * `density`: Number of pixels per inch (DPI), if present
 * `hasProfile`: Boolean indicating the presence of an embedded ICC profile
@@ -175,12 +175,11 @@ Possible attributes of `sharp.gravity` are
 `north`, `northeast`, `east`, `southeast`, `south`,
 `southwest`, `west`, `northwest`, `center` and `centre`.

-Possible attributes of the experimental `sharp.strategy` are:
+The experimental strategy-based approach resizes so one dimension is at its target length
+then repeatedly ranks edge regions, discarding the edge with the lowest score based on the selected strategy.

-* `entropy`: resize so one dimension is at its target size
-then repeatedly remove pixels from the edge with the lowest
-[Shannon entropy](https://en.wikipedia.org/wiki/Entropy_%28information_theory%29)
-until it too reaches the target size.
+* `entropy`: focus on the region with the highest [Shannon entropy](https://en.wikipedia.org/wiki/Entropy_%28information_theory%29).
+* `attention`: focus on the region with the highest luminance frequency, colour saturation and presence of skin tones.

 The default crop option is a `center`/`centre` gravity.

@@ -298,6 +297,12 @@ sharp(input)
  });
 ```

+#### trim([tolerance])
+
+Trim "boring" pixels from all edges that contain values within a percentage similarity of the top-left pixel.
+
+* `tolerance`, if present, is an integral Number between 1 and 99 representing the percentage similarity, defaulting to 10.
+
 #### background(rgba)

 Set the background for the `embed`, `flatten` and `extend` operations.
@@ -381,6 +386,30 @@ When a `sigma` is provided, performs a slower, more accurate Gaussian blur. This

 * `sigma`, if present, is a Number between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.

+#### convolve(kernel)
+
+Convolve the image with the specified `kernel`, an Object with the following attributes:
+
+* `width` is an integral Number representing the width of the kernel in pixels.
+* `height` is an integral Number representing the width of the kernel in pixels.
+* `kernel` is an Array of length `width*height` containing the kernel values.
+* `scale`, if present, is a Number representing the scale of the kernel in pixels, defaulting to the sum of the kernel's values.
+* `offset`, if present, is a Number representing the offset of the kernel in pixels, defaulting to 0.
+
+```javascript
+sharp(input)
+  .convolve({
+    width: 3,
+    height: 3,
+    kernel: [-1, 0, 1, -2, 0, 2, -1, 0, 1]
+  })
+  .raw()
+  .toBuffer(function(err, data, info) {
+    // data contains the raw pixel data representing the convolution
+    // of the input image with the horizontal Sobel operator
+  });
+```
+
 #### sharpen([sigma], [flat], [jagged])

 When used without parameters, performs a fast, mild sharpen of the output image. This typically reduces performance by 10%.
@@ -391,11 +420,13 @@ When a `sigma` is provided, performs a slower, more accurate sharpen of the L ch
 * `flat`, if present, is a Number representing the level of sharpening to apply to "flat" areas, defaulting to a value of 1.0.
 * `jagged`, if present, is a Number representing the level of sharpening to apply to "jagged" areas, defaulting to a value of 2.0.

-#### threshold([threshold])
+#### threshold([threshold], [options])

-Converts all pixels in the image to greyscale white or black.  Any pixel greather-than-or-equal-to the threshold (0..255) will be white.  All others will be black.
+Any pixel value greather than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
+By default, the image will be converted to single channel greyscale before thresholding.

-* `threshold`, if present, is a Number, representing the level above which pixels will be forced to white.
+* `threshold`, if present, is a Number between 0 and 255, representing the level at which the threshold will be applied. The default threshold is 128.
+* `options`, if present, is an Object containing a Boolean `greyscale` (or `grayscale`). When `false` each channel will have the threshold applied independently.

 #### gamma([gamma])

@@ -413,7 +444,7 @@ Convert to 8-bit greyscale; 256 shades of grey.

 This is a linear operation. If the input image is in a non-linear colour space such as sRGB, use `gamma()` with `greyscale()` for the best results.

-The output image will still be web-friendly sRGB and contain three (identical) channels.
+By default the output image will be web-friendly sRGB and contain three (identical) color channels. This may be overridden by other sharp operations such as `toColourspace('b-w')`, which will produce an output image containing one color channel. An alpha channel may be present, and will be unchanged by the operation.

 #### normalize() / normalise()

@@ -421,16 +452,23 @@ Enhance output image contrast by stretching its luminance to cover the full dyna

 #### overlayWith(image, [options])

-Overlay (composite) a image containing an alpha channel over the processed (resized, extracted etc.) image.
+Overlay (composite) a image over the processed (resized, extracted etc.) image.

 `image` is one of the following, and must be the same size or smaller than the processed image:

-* Buffer containing PNG, WebP, GIF or SVG image data, or
-* String containing the path to an image file, with most major transparency formats supported.
+* Buffer containing image data, or
+* String containing the path to an image file

 `options`, if present, is an Object with the following optional attributes:

 * `gravity` is a String or an attribute of the `sharp.gravity` Object e.g. `sharp.gravity.north` at which to place the overlay, defaulting to `center`/`centre`.
+* `top` is an integral Number representing the pixel offset from the top edge.
+* `left` is an integral Number representing the pixel offset from the left edge.
+* `tile` is a Boolean, defaulting to `false`. When set to `true` repeats the overlay image across the entire image with the given `gravity`.
+* `cutout` is a Boolean, defaulting to `false`. When set to `true` applies only the alpha channel of the overlay image to the image to be overlaid, giving the appearance of one image being cut out of another.
+* `raw` an Object containing `width`, `height` and `channels` when providing uncompressed data.
+
+If both `top` and `left` are provided, they take precedence over `gravity`.

 ```javascript
 sharp('input.png')
@@ -451,13 +489,87 @@ sharp('input.png')
  });
 ```

+#### toColourspace(colourspace) / toColorspace(colorspace)
+
+Set the output colourspace. By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.  
+  
+`colourspace` is a string or `sharp.colourspace` enum that identifies an output colourspace. String arguments comprise vips colour space interpretation names  e.g. `srgb`, `rgb`, `scrgb`, `cmyk`, `lab`, `xyz`, `b-w` [...](https://github.com/jcupitt/libvips/blob/master/libvips/iofuncs/enumtypes.c#L568)
+  
+#### extractChannel(channel)
+
+Extract a single channel from a multi-channel image.
+
+`channel` is a zero-indexed integral Number representing the band number to extract. `red`, `green` or `blue` are also accepted as an alternative to `0`, `1` or `2` respectively.
+
+```javascript
+sharp(input)
+  .extractChannel('green')
+  .toFile('input_green.jpg', function(err, info) {
+    // info.channels === 1
+    // input_green.jpg contains the green channel of the input image
+   });
+```
+
+#### joinChannel(channels, [options])
+
+Join a data channel to the image. The meaning of the added channels depends on the output colourspace, set with `toColourspace()`. By default the output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
+
+`channels` is one of
+* a single file path
+* an array of file paths
+* a single buffer
+* an array of buffers
+
+Note that channel ordering follows vips convention:
+* sRGB: 0: Red, 1: Green, 2: Blue, 3: Alpha
+* CMYK: 0: Magenta, 1: Cyan, 2: Yellow, 3: Black, 4: Alpha
+
+Buffers may be any of the image formats supported by sharp: JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data. In the case of a RAW buffer, the `options` object should contain a `raw` attribute, which follows the format of the attribute of the same name in the `sharp()` constructor. See `sharp()` for details. See `raw()` for pixel ordering. 
+
+#### bandbool(operation)
+
+Perform a bitwise boolean operation on all input image channels (bands) to produce a single channel output image.
+
+`operation` is a string containing the name of the bitwise operator to be appled to image channels, which can be one of:
+
+* `and` performs a bitwise and operation, like the c-operator `&`.
+* `or` performs a bitwise or operation, like the c-operator `|`.
+* `eor` performs a bitwise exclusive or operation, like the c-operator `^`.
+
+```javascript
+sharp('input.png')
+  .bandbool(sharp.bool.and)
+  .toFile('output.png')
+```
+
+In the above example if `input.png` is a 3 channel RGB image, `output.png` will be a 1 channel grayscale image where each pixel `P = R & G & B`.
+For example, if `I(1,1) = [247, 170, 14] = [0b11110111, 0b10101010, 0b00001111]` then `O(1,1) = 0b11110111 & 0b10101010 & 0b00001111 = 0b00000010 = 2`.
+
+#### boolean(image, operation, [options])
+
+Perform a bitwise boolean operation with `image`, where `image` is one of the following:
+
+* Buffer containing JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data, or
+* String containing the path to an image file
+
+This operation creates an output image where each pixel is the result of the selected bitwise boolean `operation` between the corresponding pixels of the input images.
+The boolean operation can be one of the following:
+
+* `and` performs a bitwise and operation, like the c-operator `&`.
+* `or` performs a bitwise or operation, like the c-operator `|`.
+* `eor` performs a bitwise exclusive or operation, like the c-operator `^`.
+
+`options`, if present, is an Object with the following optional attributes:
+
+* `raw` an Object containing `width`, `height` and `channels` when providing uncompressed data.
+
 ### Output

 #### toFile(path, [callback])

 `path` is a String containing the path to write the image data to.

-If an explicit output format is not selected, it will be inferred from the extension, with JPEG, PNG, WebP, TIFF and DZI supported.
+If an explicit output format is not selected, it will be inferred from the extension, with JPEG, PNG, WebP, TIFF, DZI, and VIPS V format supported. Note that RAW format is only supported for buffer output.

 `callback`, if present, is called with two arguments `(err, info)` where:

@@ -468,7 +580,7 @@ A Promises/A+ promise is returned when `callback` is not provided.

 #### toBuffer([callback])

-Write image data to a Buffer, the format of which will match the input image by default. JPEG, PNG and WebP are supported.
+Write image data to a Buffer, the format of which will match the input image by default. JPEG, PNG, WebP, and RAW are supported.

 `callback`, if present, gets three arguments `(err, buffer, info)` where:

@@ -541,7 +653,7 @@ The size, overlap, container and directory layout to use when generating square
 * `container` is a String, with value `fs` or `zip`. The default value is `fs`.
 * `layout` is a String, with value `dz`, `zoomify` or `google`. The default value is `dz`.

-You can also use the file extension .zip or .szi to write to a ZIP container instead of the filesystem.
+You can also use the file extension `.zip` or `.szi` to write to a compressed archive file format.

 ```javascript
 sharp('input.tiff')
@@ -658,6 +770,8 @@ If `options` is provided, sets the limits of _libvips'_ operation cache.

 `options` can also be a boolean, where `true` enables the default cache settings and `false` disables all caching.

+Existing entries in the cache will be trimmed after any change in limits.
+
 This method always returns cache statistics, useful for determining how much working memory is required for a particular task.

 ```javascript
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,9 +1,144 @@
 # Changelog

+### v0.16 - "*pencil*"
+
+Requires libvips v8.3.3
+
+#### v0.16.2 - 22<sup>nd</sup> October 2016
+
+* Restrict readelf usage to Linux only when detecting global libvips version.
+  [#602](https://github.com/lovell/sharp/issues/602)
+  [@caoko](https://github.com/caoko)
+
+#### v0.16.1 - 13<sup>th</sup> October 2016
+
+* C++11 ABI version is now auto-detected, remove sharp-cxx11 installation flag.
+
+* Add experimental 'attention' crop strategy.
+  [#295](https://github.com/lovell/sharp/issues/295)
+
+* Include .node extension for Meteor's require() implementation.
+  [#537](https://github.com/lovell/sharp/issues/537)
+  [@isjackwild](https://github.com/isjackwild)
+
+* Ensure convolution kernel scale is clamped to a minimum value of 1.
+  [#561](https://github.com/lovell/sharp/issues/561)
+  [@abagshaw](https://github.com/abagshaw)
+
+* Correct calculation of y-axis placement when overlaying image at a fixed point.
+  [#566](https://github.com/lovell/sharp/issues/566)
+  [@Nateowami](https://github.com/Nateowami)
+
+#### v0.16.0 - 18<sup>th</sup> August 2016
+
+* Add pre-compiled libvips for OS X, ARMv7 and ARMv8.
+  [#312](https://github.com/lovell/sharp/issues/312)
+
+* Ensure boolean, bandbool, extractChannel ops occur before sRGB conversion.
+  [#504](https://github.com/lovell/sharp/pull/504)
+  [@mhirsch](https://github.com/mhirsch)
+
+* Recalculate factors after WebP shrink-on-load to avoid round-to-zero errors.
+  [#508](https://github.com/lovell/sharp/issues/508)
+  [@asilvas](https://github.com/asilvas)
+
+* Prevent boolean errors during extract operation.
+  [#511](https://github.com/lovell/sharp/pull/511)
+  [@mhirsch](https://github.com/mhirsch)
+
+* Add joinChannel and toColourspace/toColorspace operations.
+  [#513](https://github.com/lovell/sharp/pull/513)
+  [@mhirsch](https://github.com/mhirsch)
+
+* Add support for raw pixel data with boolean and withOverlay operations.
+  [#516](https://github.com/lovell/sharp/pull/516)
+  [@mhirsch](https://github.com/mhirsch)
+
+* Prevent bandbool creating a single channel sRGB image.
+  [#519](https://github.com/lovell/sharp/pull/519)
+  [@mhirsch](https://github.com/mhirsch)
+
+* Ensure ICC profiles are removed from PNG output unless withMetadata used.
+  [#521](https://github.com/lovell/sharp/issues/521)
+  [@ChrisPinewood](https://github.com/ChrisPinewood)
+
+* Add alpha channels, if missing, to overlayWith images.
+  [#540](https://github.com/lovell/sharp/pull/540)
+  [@cmtt](https://github.com/cmtt)
+
+* Remove deprecated interpolateWith method - use resize(w, h, { interpolator: ... })
+  [#310](https://github.com/lovell/sharp/issues/310)
+
 ### v0.15 - "*outfit*"

 Requires libvips v8.3.1

+#### v0.15.1 - 12<sup>th</sup> July 2016
+
+* Concat Stream-based input in single operation for ~+3% perf and less GC.
+  [#429](https://github.com/lovell/sharp/issues/429)
+  [@papandreou](https://github.com/papandreou)
+
+* Add alpha channel, if required, before extend operation.
+  [#439](https://github.com/lovell/sharp/pull/439)
+  [@frulo](https://github.com/frulo)
+
+* Allow overlay image to be repeated across entire image via tile option.
+  [#443](https://github.com/lovell/sharp/pull/443)
+  [@lemnisk8](https://github.com/lemnisk8)
+
+* Add cutout option to overlayWith feature, applies only the alpha channel of the overlay image.
+  [#448](https://github.com/lovell/sharp/pull/448)
+  [@kleisauke](https://github.com/kleisauke)
+
+* Ensure scaling factors are calculated independently to prevent rounding errors.
+  [#452](https://github.com/lovell/sharp/issues/452)
+  [@puzrin](https://github.com/puzrin)
+
+* Add --sharp-cxx11 flag to compile with gcc's new C++11 ABI.
+  [#456](https://github.com/lovell/sharp/pull/456)
+  [@kapouer](https://github.com/kapouer)
+
+* Add top/left offset support to overlayWith operation.
+  [#473](https://github.com/lovell/sharp/pull/473)
+  [@rnanwani](https://github.com/rnanwani)
+
+* Add convolve operation for kernel-based convolution.
+  [#479](https://github.com/lovell/sharp/pull/479)
+  [@mhirsch](https://github.com/mhirsch)
+
+* Add greyscale option to threshold operation for colourspace conversion control.
+  [#480](https://github.com/lovell/sharp/pull/480)
+  [@mhirsch](https://github.com/mhirsch)
+
+* Ensure ICC profiles are licenced for distribution.
+  [#486](https://github.com/lovell/sharp/issues/486)
+  [@kapouer](https://github.com/kapouer)
+
+* Allow images with an alpha channel to work with LAB-colourspace based sharpen.
+  [#490](https://github.com/lovell/sharp/issues/490)
+  [@jwagner](https://github.com/jwagner)
+
+* Add trim operation to remove "boring" edges.
+  [#492](https://github.com/lovell/sharp/pull/492)
+  [@kleisauke](https://github.com/kleisauke)
+
+* Add bandbool feature for channel-wise boolean operations.
+  [#496](https://github.com/lovell/sharp/pull/496)
+  [@mhirsch](https://github.com/mhirsch)
+
+* Add extractChannel operation to extract a channel from an image.
+  [#497](https://github.com/lovell/sharp/pull/497)
+  [@mhirsch](https://github.com/mhirsch)
+
+* Add ability to read and write native libvips .v files.
+  [#500](https://github.com/lovell/sharp/pull/500)
+  [@mhirsch](https://github.com/mhirsch)
+
+* Add boolean feature for bitwise image operations.
+  [#501](https://github.com/lovell/sharp/pull/501)
+  [@mhirsch](https://github.com/mhirsch)
+
 #### v0.15.0 - 21<sup>st</sup> May 2016

 * Use libvips' new Lanczos 3 kernel as default for image reduction.
@@ -84,6 +219,9 @@ Requires libvips v8.2.3
  [#387](https://github.com/lovell/sharp/issues/387)
  [@kleisauke](https://github.com/kleisauke)

+* Remove deprecated style of calling extract API. Breaks calls using positional arguments.
+  [#276](https://github.com/lovell/sharp/issues/276)
+
 ### v0.13 - "*mind*"

 Requires libvips v8.2.2
--- a/docs/index.md
+++ b/docs/index.md
@@ -13,12 +13,9 @@ Lanczos resampling ensures quality is not sacrificed for speed.
 As well as image resizing, operations such as
 rotation, extraction, compositing and gamma correction are available.

-Most Windows (x64), Linux and ARMv6+ systems do not require
+OS X, Windows (x64), Linux (x64, ARM) systems do not require
 the installation of any external runtime dependencies.

-Use with OS X is as simple as running `brew install homebrew/science/vips`
-to install the libvips dependency.
-
 [![Test Coverage](https://coveralls.io/repos/lovell/sharp/badge.png?branch=master)](https://coveralls.io/r/lovell/sharp?branch=master)

 ### Formats
@@ -92,6 +89,11 @@ the help and code contributions of the following people:
 * [Kenton Gray](https://github.com/kentongray)
 * [Felix Bünemann](https://github.com/felixbuenemann)
 * [Samy Al Zahrani](https://github.com/salzhrani)
+* [Chintan Thakkar](https://github.com/lemnisk8)
+* [F. Orlando Galashan](https://github.com/frulo)
+* [Kleis Auke Wolthuizen](https://github.com/kleisauke)
+* [Matt Hirsch](https://github.com/mhirsch)
+* [Rahul Nanwani](https://github.com/rnanwani)

 Thank you!

--- a/docs/install.md
+++ b/docs/install.md
@@ -7,7 +7,7 @@ npm install sharp
 ### Prerequisites

 * C++11 compatible compiler such as gcc 4.8+, clang 3.0+ or MSVC 2013+
-* [node-gyp](https://github.com/TooTallNate/node-gyp#installation)
+* [node-gyp](https://github.com/TooTallNate/node-gyp#installation) and its dependencies

 ### Linux

@@ -15,23 +15,22 @@ npm install sharp
 [![Linux Build Status](https://circleci.com/gh/lovell/sharp.svg?style=svg&circle-token=6cb6d1d287a51af83722b19ed8885377fbc85e5c)](https://circleci.com/gh/lovell/sharp)

 libvips and its dependencies are fetched and stored within `node_modules/sharp/lib` during `npm install`.
-This involves an automated HTTPS download of approximately 6.7MB.
+This involves an automated HTTPS download of approximately 6.5MB.

 Most recent Linux-based operating systems with glibc running on x64 and ARMv6+ CPUs should "just work", e.g.:

 * Debian 7, 8
-* Ubuntu 12.04, 14.04, 15.10, 16.04
+* Ubuntu 12.04, 14.04, 16.04
 * Centos 7
-* Fedora 22, 23
+* Fedora 23, 24
 * openSUSE 13.2
-* Archlinux 2015.06.01
+* Archlinux
 * Raspbian Jessie
-* Amazon Linux 2015.03, 2015.09
+* Amazon Linux 2016.03, 2016.09

-To use your own version of libvips instead of the provided binaries, make sure it is
-at least the version listed under `config.libvips` in the `package.json` file,
-that it can be located using `pkg-config --modversion vips-cpp`
-and that it has been compiled with `_GLIBCXX_USE_CXX11_ABI=0`.
+To use a globally-installed version of libvips instead of the provided binaries,
+make sure it is at least the version listed under `config.libvips` in the `package.json` file
+and that it can be located using `pkg-config --modversion vips-cpp`.

 If you are using non-stadard paths (anything other than `/usr` or `/usr/local`),
 you might need to set `PKG_CONFIG_PATH` during `npm install`
@@ -54,40 +53,18 @@ For Linux-based operating systems such as Alpine that use musl libc,
 the smaller stack size means libvips' cache should be disabled
 via `sharp.cache(false)` to avoid a stack overflow.

-Beware of Linux OS upgrades that introduce v5.1+ of the `g++` compiler due to
-[changes](https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html)
-in the C++11 ABI.
-This module assumes the previous behaviour, which can be enforced by setting the
-`_GLIBCXX_USE_CXX11_ABI=0` environment variable at libvips' compile time.
-
 ### Mac OS

 [![OS X 10.9.5 Build Status](https://travis-ci.org/lovell/sharp.png?branch=master)](https://travis-ci.org/lovell/sharp)

-libvips must be installed before `npm install` is run.
-This can be achieved via homebrew:
+libvips and its dependencies are fetched and stored within `node_modules/sharp/lib` during `npm install`.
+This involves an automated HTTPS download of approximately 6.5MB.

-```sh
-brew install homebrew/science/vips
-```
+To use your own version of libvips instead of the provided binaries, make sure it is
+at least the version listed under `config.libvips` in the `package.json` file and
+that it can be located using `pkg-config --modversion vips-cpp`.

-For WebP suppport use:
-
-```sh
-brew install homebrew/science/vips --with-webp
-```
-
-A missing or incorrectly configured _Xcode Command Line Tools_ installation
-[can lead](https://github.com/lovell/sharp/issues/80) to a
-`library not found for -ljpeg` error.
-If so, please try: `xcode-select --install`.
-
-The _gettext_ dependency of _libvips_
-[can lead](https://github.com/lovell/sharp/issues/9)
-to a `library not found for -lintl` error.
-If so, please try `brew link gettext --force`.
-
-### Windows
+### Windows x64

 [![Windows x64 Build Status](https://ci.appveyor.com/api/projects/status/pgtul704nkhhg6sg)](https://ci.appveyor.com/project/lovell/sharp)

@@ -193,3 +170,47 @@ configuration file to prevent the use of coders known to be vulnerable.

 Set the `MAGICK_CONFIGURE_PATH` environment variable
 to the directory containing the `policy.xml` file.
+
+### Licences
+
+If a global installation of libvips that meets the
+minimum version requirement cannot be found,
+this module will download a pre-compiled bundle of libvips
+and its dependencies on Linux and Windows machines.
+
+Should you need to manually download and inspect these files,
+you can do so via https://dl.bintray.com/lovell/sharp/
+
+This module is licensed under the terms of the
+[Apache 2.0 Licence](https://github.com/lovell/sharp/blob/master/LICENSE).
+
+The libraries downloaded and used by this module
+are done so under the terms of the following licences,
+all of which are compatible with the Apache 2.0 Licence.
+
+Use of libraries under the terms of the LGPLv3 is via the
+"any later version" clause of the LGPLv2 or LGPLv2.1.
+
+| Library       | Used under the terms of                                                                                  |
+|---------------|----------------------------------------------------------------------------------------------------------|
+| cairo         | Mozilla Public License 2.0                                                                               |
+| fontconfig    | [fontconfig Licence](https://cgit.freedesktop.org/fontconfig/tree/COPYING) (BSD-like)                    |
+| freetype      | [freetype Licence](http://git.savannah.gnu.org/cgit/freetype/freetype2.git/tree/docs/FTL.TXT) (BSD-like) |
+| giflib        | MIT Licence                                                                                              |
+| glib          | LGPLv3                                                                                                   |
+| harfbuzz      | MIT Licence                                                                                              |
+| lcms          | MIT Licence                                                                                              |
+| libcroco      | LGPLv3                                                                                                   |
+| libexif       | LGPLv3                                                                                                   |
+| libffi        | MIT Licence                                                                                              |
+| libgsf        | LGPLv3                                                                                                   |
+| libjpeg-turbo | [zlib License, IJG License](https://github.com/libjpeg-turbo/libjpeg-turbo/blob/master/LICENSE.md)       |
+| libpng        | [libpng License](http://www.libpng.org/pub/png/src/libpng-LICENSE.txt)                                   |
+| librsvg       | LGPLv3                                                                                                   |
+| libtiff       | [libtiff License](http://www.libtiff.org/misc.html) (BSD-like)                                           |
+| libvips       | LGPLv3                                                                                                   |
+| libwebp       | New BSD License                                                                                          |
+| libxml2       | MIT Licence                                                                                              |
+| pango         | LGPLv3                                                                                                   |
+| pixman        | MIT Licence                                                                                              |
+| zlib          | [zlib Licence](https://github.com/madler/zlib/blob/master/zlib.h)                                        |
--- a/icc/USWebCoatedSWOP.icc
+++ b/icc/USWebCoatedSWOP.icc
--- a/icc/cmyk.icm
+++ b/icc/cmyk.icm
--- a/icc/sRGB.icc
+++ b/icc/sRGB.icc
--- a/icc/sRGB_IEC61966-2-1_black_scaled.icc
+++ b/icc/sRGB_IEC61966-2-1_black_scaled.icc
--- a/index.js
+++ b/index.js
@@ -9,7 +9,7 @@ var semver = require('semver');
 var color = require('color');
 var BluebirdPromise = require('bluebird');

-var sharp = require('./build/Release/sharp');
+var sharp = require('./build/Release/sharp.node');

 // Versioning
 var versions = {
@@ -42,14 +42,8 @@ var Sharp = function(input, options) {
  stream.Duplex.call(this);
  this.options = {
    // input options
-    bufferIn: null,
-    streamIn: false,
    sequentialRead: false,
    limitInputPixels: maximum.pixels,
-    density: 72,
-    rawWidth: 0,
-    rawHeight: 0,
-    rawChannels: 0,
    // ICC profiles
    iccProfilePath: path.join(__dirname, 'icc') + path.sep,
    // resize options
@@ -85,13 +79,20 @@ var Sharp = function(input, options) {
    sharpenFlat: 1,
    sharpenJagged: 2,
    threshold: 0,
+    thresholdGrayscale: true,
+    trimTolerance: 0,
    gamma: 0,
    greyscale: false,
    normalize: 0,
+    booleanBufferIn: null,
+    booleanFileIn: '',
+    joinChannelIn: [],
    // overlay
-    overlayFileIn: '',
-    overlayBufferIn: null,
    overlayGravity: 0,
+    overlayXOffset : -1,
+    overlayYOffset : -1,
+    overlayTile: false,
+    overlayCutout: false,
    // output options
    formatOut: 'input',
    fileOut: '',
@@ -108,24 +109,14 @@ var Sharp = function(input, options) {
    withMetadataOrientation: -1,
    tileSize: 256,
    tileOverlap: 0,
+    extractChannel: -1,
+    colourspace: 'srgb',
    // Function to notify of queue length changes
    queueListener: function(queueLength) {
      module.exports.queue.emit('change', queueLength);
    }
  };
-  if (isString(input)) {
-    // input=file
-    this.options.fileIn = input;
-  } else if (isBuffer(input)) {
-    // input=buffer
-    this.options.bufferIn = input;
-  } else if (!isDefined(input)) {
-    // input=stream
-    this.options.streamIn = true;
-  } else {
-    throw new Error('Unsupported input ' + typeof input);
-  }
-  this._inputOptions(options);
+  this.options.input = this._createInputDescriptor(input, options, { allowStream: true });
  return this;
 };
 module.exports = Sharp;
@@ -178,37 +169,50 @@ var contains = function(val, list) {
 };

 /*
-  Set input-related options
-    density: DPI at which to load vector images via libmagick
+  Create Object containing input and input-related options
 */
-Sharp.prototype._inputOptions = function(options) {
-  if (isObject(options)) {
+Sharp.prototype._createInputDescriptor = function(input, inputOptions, containerOptions) {
+  var inputDescriptor = {};
+  if (isString(input)) {
+    // filesystem
+    inputDescriptor.file = input;
+  } else if (isBuffer(input)) {
+    // Buffer
+    inputDescriptor.buffer = input;
+  } else if (!isDefined(input) && isObject(containerOptions) && containerOptions.allowStream) {
+    // Stream
+    inputDescriptor.buffer = [];
+  } else {
+    throw new Error('Unsupported input ' + typeof input);
+  }
+  if (isObject(inputOptions)) {
    // Density
-    if (isDefined(options.density)) {
-      if (isInteger(options.density) && inRange(options.density, 1, 2400)) {
-        this.options.density = options.density;
+    if (isDefined(inputOptions.density)) {
+      if (isInteger(inputOptions.density) && inRange(inputOptions.density, 1, 2400)) {
+        inputDescriptor.density = inputOptions.density;
      } else {
-        throw new Error('Invalid density (1 to 2400) ' + options.density);
+        throw new Error('Invalid density (1 to 2400) ' + inputOptions.density);
      }
    }
    // Raw pixel input
-    if (isDefined(options.raw)) {
+    if (isDefined(inputOptions.raw)) {
      if (
-        isObject(options.raw) &&
-        isInteger(options.raw.width) && inRange(options.raw.width, 1, maximum.width) &&
-        isInteger(options.raw.height) && inRange(options.raw.height, 1, maximum.height) &&
-        isInteger(options.raw.channels) && inRange(options.raw.channels, 1, 4)
+        isObject(inputOptions.raw) &&
+        isInteger(inputOptions.raw.width) && inRange(inputOptions.raw.width, 1, maximum.width) &&
+        isInteger(inputOptions.raw.height) && inRange(inputOptions.raw.height, 1, maximum.height) &&
+        isInteger(inputOptions.raw.channels) && inRange(inputOptions.raw.channels, 1, 4)
      ) {
-        this.options.rawWidth = options.raw.width;
-        this.options.rawHeight = options.raw.height;
-        this.options.rawChannels = options.raw.channels;
+        inputDescriptor.rawWidth = inputOptions.raw.width;
+        inputDescriptor.rawHeight = inputOptions.raw.height;
+        inputDescriptor.rawChannels = inputOptions.raw.channels;
      } else {
        throw new Error('Expected width, height and channels for raw pixel input');
      }
    }
-  } else if (isDefined(options)) {
-    throw new Error('Invalid input options ' + options);
+  } else if (isDefined(inputOptions)) {
+    throw new Error('Invalid input options ' + inputOptions);
  }
+  return inputDescriptor;
 };

 /*
@@ -216,19 +220,9 @@ Sharp.prototype._inputOptions = function(options) {
 */
 Sharp.prototype._write = function(chunk, encoding, callback) {
  /*jslint unused: false */
-  if (this.options.streamIn) {
-    if (typeof chunk === 'object' && chunk instanceof Buffer) {
-      if (this.options.bufferIn instanceof Buffer) {
-        // Append to existing Buffer
-        this.options.bufferIn = Buffer.concat(
-          [this.options.bufferIn, chunk],
-          this.options.bufferIn.length + chunk.length
-        );
-      } else {
-        // Create new Buffer
-        this.options.bufferIn = new Buffer(chunk.length);
-        chunk.copy(this.options.bufferIn);
-      }
+  if (Array.isArray(this.options.input.buffer)) {
+    if (isBuffer(chunk)) {
+      this.options.input.buffer.push(chunk);
      callback();
    } else {
      callback(new Error('Non-Buffer data on Writable Stream'));
@@ -238,6 +232,18 @@ Sharp.prototype._write = function(chunk, encoding, callback) {
  }
 };

+/*
+  Flattens the array of chunks accumulated in input.buffer
+*/
+Sharp.prototype._flattenBufferIn = function() {
+  if (this._isStreamInput()) {
+    this.options.input.buffer = Buffer.concat(this.options.input.buffer);
+  }
+};
+Sharp.prototype._isStreamInput = function() {
+  return Array.isArray(this.options.input.buffer);
+};
+
 // Weighting to apply to image crop
 module.exports.gravity = {
  center: 0,
@@ -254,7 +260,8 @@ module.exports.gravity = {

 // Strategies for automagic behaviour
 module.exports.strategy = {
-  entropy: 16
+  entropy: 16,
+  attention: 17
 };

 /*
@@ -271,7 +278,7 @@ Sharp.prototype.crop = function(crop) {
  } else if (isString(crop) && isInteger(module.exports.gravity[crop])) {
    // Gravity (string)
    this.options.crop = module.exports.gravity[crop];
-  } else if (isInteger(crop) && crop === module.exports.strategy.entropy) {
+  } else if (isInteger(crop) && crop >= module.exports.strategy.entropy) {
    // Strategy
    this.options.crop = crop;
  } else {
@@ -297,6 +304,21 @@ Sharp.prototype.extract = function(options) {
  return this;
 };

+Sharp.prototype.extractChannel = function(channel) {
+  if (channel === 'red')
+    channel = 0;
+  else if (channel === 'green')
+    channel = 1;
+  else if (channel === 'blue')
+    channel = 2;
+  if(isInteger(channel) && inRange(channel,0,4)) {
+    this.options.extractChannel = channel;
+  } else {
+    throw new Error('Cannot extract invalid channel ' + channel);
+  }
+  return this;
+};
+
 /*
  Set the background colour for embed and flatten operations.
  Delegates to the 'Color' module, which can throw an Error
@@ -334,12 +356,25 @@ Sharp.prototype.ignoreAspectRatio = function() {
 };

 Sharp.prototype.flatten = function(flatten) {
-  this.options.flatten = (typeof flatten === 'boolean') ? flatten : true;
+  this.options.flatten = isBoolean(flatten) ? flatten : true;
  return this;
 };

 Sharp.prototype.negate = function(negate) {
-  this.options.negate = (typeof negate === 'boolean') ? negate : true;
+  this.options.negate = isBoolean(negate) ? negate : true;
+  return this;
+};
+
+/*
+  Bitwise boolean operations between images
+*/
+Sharp.prototype.boolean = function(operand, operator, options) {
+  this.options.boolean = this._createInputDescriptor(operand, options);
+  if (isString(operator) && contains(operator, ['and', 'or', 'eor'])) {
+    this.options.booleanOp = operator;
+  } else {
+    throw new Error('Invalid boolean operation ' + operator);
+  }
  return this;
 };

@@ -347,21 +382,58 @@ Sharp.prototype.negate = function(negate) {
  Overlay with another image, using an optional gravity
 */
 Sharp.prototype.overlayWith = function(overlay, options) {
-  if (isString(overlay)) {
-    this.options.overlayFileIn = overlay;
-  } else if (isBuffer(overlay)) {
-    this.options.overlayBufferIn = overlay;
-  } else {
-    throw new Error('Unsupported overlay ' + typeof overlay);
-  }
+  this.options.overlay = this._createInputDescriptor(overlay, options, {
+    allowStream: false
+  });
  if (isObject(options)) {
-    if (isInteger(options.gravity) && inRange(options.gravity, 0, 8)) {
-      this.options.overlayGravity = options.gravity;
-    } else if (isString(options.gravity) && isInteger(module.exports.gravity[options.gravity])) {
-      this.options.overlayGravity = module.exports.gravity[options.gravity];
-    } else if (isDefined(options.gravity)) {
-      throw new Error('Unsupported overlay gravity ' + options.gravity);
+    if (isDefined(options.tile)) {
+      if (isBoolean(options.tile)) {
+        this.options.overlayTile = options.tile;
+      } else {
+        throw new Error('Invalid overlay tile ' + options.tile);
+      }
    }
+    if (isDefined(options.cutout)) {
+      if (isBoolean(options.cutout)) {
+        this.options.overlayCutout = options.cutout;
+      } else {
+        throw new Error('Invalid overlay cutout ' + options.cutout);
+      }
+    }
+    if (isDefined(options.left) || isDefined(options.top)) {
+      if (
+        isInteger(options.left) && inRange(options.left, 0, maximum.width) &&
+        isInteger(options.top) && inRange(options.top, 0, maximum.height)
+      ) {
+        this.options.overlayXOffset = options.left;
+        this.options.overlayYOffset = options.top;
+      } else {
+        throw new Error('Invalid overlay left ' + options.left + ' and/or top ' + options.top);
+      }
+    }
+    if (isDefined(options.gravity)) {
+      if(isInteger(options.gravity) && inRange(options.gravity, 0, 8)) {
+        this.options.overlayGravity = options.gravity;
+      } else if (isString(options.gravity) && isInteger(module.exports.gravity[options.gravity])) {
+        this.options.overlayGravity = module.exports.gravity[options.gravity];
+      } else {
+        throw new Error('Unsupported overlay gravity ' + options.gravity);
+      }
+    }
+  }
+  return this;
+};
+
+/*
+  Add another color channel to the image
+*/
+Sharp.prototype.joinChannel = function(images, options) {
+  if (Array.isArray(images)) {
+    images.forEach(function(image) {
+      this.options.joinChannelIn.push(this._createInputDescriptor(image, options));
+    }, this);
+  } else {
+    this.options.joinChannelIn.push(this._createInputDescriptor(images, options));
  }
  return this;
 };
@@ -371,9 +443,9 @@ Sharp.prototype.overlayWith = function(overlay, options) {
  Auto-rotation based on the EXIF Orientation tag is represented by an angle of -1
 */
 Sharp.prototype.rotate = function(angle) {
-  if (typeof angle === 'undefined') {
+  if (!isDefined(angle)) {
    this.options.angle = -1;
-  } else if (!Number.isNaN(angle) && [0, 90, 180, 270].indexOf(angle) !== -1) {
+  } else if (isInteger(angle) && contains(angle, [0, 90, 180, 270])) {
    this.options.angle = angle;
  } else {
    throw new Error('Unsupported angle (0, 90, 180, 270) ' + angle);
@@ -385,7 +457,7 @@ Sharp.prototype.rotate = function(angle) {
  Flip the image vertically, about the Y axis
 */
 Sharp.prototype.flip = function(flip) {
-  this.options.flip = (typeof flip === 'boolean') ? flip : true;
+  this.options.flip = isBoolean(flip) ? flip : true;
  return this;
 };

@@ -393,7 +465,7 @@ Sharp.prototype.flip = function(flip) {
  Flop the image horizontally, about the X axis
 */
 Sharp.prototype.flop = function(flop) {
-  this.options.flop = (typeof flop === 'boolean') ? flop : true;
+  this.options.flop = isBoolean(flop) ? flop : true;
  return this;
 };

@@ -403,7 +475,7 @@ Sharp.prototype.flop = function(flop) {
    "change the dimensions of the image only if its width or height exceeds the geometry specification"
 */
 Sharp.prototype.withoutEnlargement = function(withoutEnlargement) {
-  this.options.withoutEnlargement = (typeof withoutEnlargement === 'boolean') ? withoutEnlargement : true;
+  this.options.withoutEnlargement = isBoolean(withoutEnlargement) ? withoutEnlargement : true;
  return this;
 };

@@ -428,6 +500,35 @@ Sharp.prototype.blur = function(sigma) {
  return this;
 };

+/*
+  Convolve the image with a kernel.
+*/
+Sharp.prototype.convolve = function(kernel) {
+  if (!isObject(kernel) || !Array.isArray(kernel.kernel) ||
+      !isInteger(kernel.width) || !isInteger(kernel.height) ||
+      !inRange(kernel.width, 3, 1001) || !inRange(kernel.height, 3, 1001) ||
+      kernel.height * kernel.width != kernel.kernel.length
+     ) {
+    // must pass in a kernel
+    throw new Error('Invalid convolution kernel');
+  }
+  // Default scale is sum of kernel values
+  if (!isInteger(kernel.scale)) {
+    kernel.scale = kernel.kernel.reduce(function(a, b) {
+      return a + b;
+    }, 0);
+  }
+  // Clamp scale to a minimum value of 1
+  if (kernel.scale < 1) {
+    kernel.scale = 1;
+  }
+  if (!isInteger(kernel.offset)) {
+    kernel.offset = 0;
+  }
+  this.options.convKernel = kernel;
+  return this;
+};
+
 /*
  Sharpen the output image.
  Call without a radius to use a fast, mild sharpen.
@@ -468,16 +569,37 @@ Sharp.prototype.sharpen = function(sigma, flat, jagged) {
  return this;
 };

-Sharp.prototype.threshold = function(threshold) {
-  if (typeof threshold === 'undefined') {
+Sharp.prototype.threshold = function(threshold, options) {
+  if (!isDefined(threshold)) {
    this.options.threshold = 128;
-  } else if (typeof threshold === 'boolean') {
+  } else if (isBoolean(threshold)) {
    this.options.threshold = threshold ? 128 : 0;
-  } else if (typeof threshold === 'number' && !Number.isNaN(threshold) && (threshold % 1 === 0) && threshold >= 0 && threshold <= 255) {
+  } else if (isInteger(threshold) && inRange(threshold, 0, 255)) {
    this.options.threshold = threshold;
  } else {
    throw new Error('Invalid threshold (0 to 255) ' + threshold);
  }
+  if (!isObject(options) || options.greyscale === true || options.grayscale === true) {
+    this.options.thresholdGrayscale = true;
+  } else {
+    this.options.thresholdGrayscale = false;
+  }
+  return this;
+};
+
+/*
+  Automatically remove "boring" image edges.
+    tolerance - if present, is a percentaged tolerance level between 0 and 100 to trim away similar color values
+      Defaulting to 10 when no tolerance is given.
+ */
+Sharp.prototype.trim = function(tolerance) {
+  if (!isDefined(tolerance)) {
+    this.options.trimTolerance = 10;
+  } else if (isInteger(tolerance) && inRange(tolerance, 1, 99)) {
+    this.options.trimTolerance = tolerance;
+  } else {
+    throw new Error('Invalid trim tolerance (1 to 99) ' + tolerance);
+  }
  return this;
 };

@@ -486,10 +608,10 @@ Sharp.prototype.threshold = function(threshold) {
  Improves brightness of resized image in non-linear colour spaces.
 */
 Sharp.prototype.gamma = function(gamma) {
-  if (typeof gamma === 'undefined') {
+  if (!isDefined(gamma)) {
    // Default gamma correction of 2.2 (sRGB)
    this.options.gamma = 2.2;
-  } else if (!Number.isNaN(gamma) && gamma >= 1 && gamma <= 3) {
+  } else if (isNumber(gamma) && inRange(gamma, 1, 3)) {
    this.options.gamma = gamma;
  } else {
    throw new Error('Invalid gamma correction (1.0 to 3.0) ' + gamma);
@@ -501,32 +623,56 @@ Sharp.prototype.gamma = function(gamma) {
  Enhance output image contrast by stretching its luminance to cover the full dynamic range
 */
 Sharp.prototype.normalize = function(normalize) {
-  this.options.normalize = (typeof normalize === 'boolean') ? normalize : true;
+  this.options.normalize = isBoolean(normalize) ? normalize : true;
  return this;
 };
 Sharp.prototype.normalise = Sharp.prototype.normalize;

+/*
+  Perform boolean/bitwise operation on image color channels - results in one channel image
+*/
+Sharp.prototype.bandbool = function(boolOp) {
+  if (isString(boolOp) && contains(boolOp, ['and', 'or', 'eor'])) {
+    this.options.bandBoolOp = boolOp;
+  } else {
+    throw new Error('Invalid bandbool operation ' + boolOp);
+  }
+  return this;
+};
+
 /*
  Convert to greyscale
 */
 Sharp.prototype.greyscale = function(greyscale) {
-  this.options.greyscale = (typeof greyscale === 'boolean') ? greyscale : true;
+  this.options.greyscale = isBoolean(greyscale) ? greyscale : true;
  return this;
 };
 Sharp.prototype.grayscale = Sharp.prototype.greyscale;

+/*
+  Set output colourspace
+*/
+Sharp.prototype.toColourspace = function(colourspace) {
+  if (!isString(colourspace) ) {
+    throw new Error('Invalid output colourspace ' + colourspace);
+  }
+  this.options.colourspace = colourspace;
+  return this;
+};
+Sharp.prototype.toColorspace = Sharp.prototype.toColourspace;
+
 Sharp.prototype.progressive = function(progressive) {
-  this.options.progressive = (typeof progressive === 'boolean') ? progressive : true;
+  this.options.progressive = isBoolean(progressive) ? progressive : true;
  return this;
 };

 Sharp.prototype.sequentialRead = function(sequentialRead) {
-  this.options.sequentialRead = (typeof sequentialRead === 'boolean') ? sequentialRead : true;
+  this.options.sequentialRead = isBoolean(sequentialRead) ? sequentialRead : true;
  return this;
 };

 Sharp.prototype.quality = function(quality) {
-  if (!Number.isNaN(quality) && quality >= 1 && quality <= 100 && quality % 1 === 0) {
+  if (isInteger(quality) && inRange(quality, 1, 100)) {
    this.options.quality = quality;
  } else {
    throw new Error('Invalid quality (1 to 100) ' + quality);
@@ -538,7 +684,7 @@ Sharp.prototype.quality = function(quality) {
  zlib compression level for PNG output
 */
 Sharp.prototype.compressionLevel = function(compressionLevel) {
-  if (!Number.isNaN(compressionLevel) && compressionLevel >= 0 && compressionLevel <= 9) {
+  if (isInteger(compressionLevel) && inRange(compressionLevel, 0, 9)) {
    this.options.compressionLevel = compressionLevel;
  } else {
    throw new Error('Invalid compressionLevel (0 to 9) ' + compressionLevel);
@@ -550,7 +696,7 @@ Sharp.prototype.compressionLevel = function(compressionLevel) {
  Disable the use of adaptive row filtering for PNG output
 */
 Sharp.prototype.withoutAdaptiveFiltering = function(withoutAdaptiveFiltering) {
-  this.options.withoutAdaptiveFiltering = (typeof withoutAdaptiveFiltering === 'boolean') ? withoutAdaptiveFiltering : true;
+  this.options.withoutAdaptiveFiltering = isBoolean(withoutAdaptiveFiltering) ? withoutAdaptiveFiltering : true;
  return this;
 };

@@ -558,7 +704,7 @@ Sharp.prototype.withoutAdaptiveFiltering = function(withoutAdaptiveFiltering) {
  Disable the use of chroma subsampling for JPEG output
 */
 Sharp.prototype.withoutChromaSubsampling = function(withoutChromaSubsampling) {
-  this.options.withoutChromaSubsampling = (typeof withoutChromaSubsampling === 'boolean') ? withoutChromaSubsampling : true;
+  this.options.withoutChromaSubsampling = isBoolean(withoutChromaSubsampling) ? withoutChromaSubsampling : true;
  return this;
 };

@@ -566,7 +712,7 @@ Sharp.prototype.withoutChromaSubsampling = function(withoutChromaSubsampling) {
  Apply trellis quantisation to JPEG output - requires mozjpeg 3.0+
 */
 Sharp.prototype.trellisQuantisation = function(trellisQuantisation) {
-  this.options.trellisQuantisation = (typeof trellisQuantisation === 'boolean') ? trellisQuantisation : true;
+  this.options.trellisQuantisation = isBoolean(trellisQuantisation) ? trellisQuantisation : true;
  return this;
 };
 Sharp.prototype.trellisQuantization = Sharp.prototype.trellisQuantisation;
@@ -575,7 +721,7 @@ Sharp.prototype.trellisQuantization = Sharp.prototype.trellisQuantisation;
  Apply overshoot deringing to JPEG output - requires mozjpeg 3.0+
 */
 Sharp.prototype.overshootDeringing = function(overshootDeringing) {
-  this.options.overshootDeringing = (typeof overshootDeringing === 'boolean') ? overshootDeringing : true;
+  this.options.overshootDeringing = isBoolean(overshootDeringing) ? overshootDeringing : true;
  return this;
 };

@@ -583,7 +729,7 @@ Sharp.prototype.overshootDeringing = function(overshootDeringing) {
  Optimise scans in progressive JPEG output - requires mozjpeg 3.0+
 */
 Sharp.prototype.optimiseScans = function(optimiseScans) {
-  this.options.optimiseScans = (typeof optimiseScans === 'boolean') ? optimiseScans : true;
+  this.options.optimiseScans = isBoolean(optimiseScans) ? optimiseScans : true;
  if (this.options.optimiseScans) {
    this.progressive();
  }
@@ -597,16 +743,10 @@ Sharp.prototype.optimizeScans = Sharp.prototype.optimiseScans;
    orientation: numeric value for EXIF Orientation tag
 */
 Sharp.prototype.withMetadata = function(withMetadata) {
-  this.options.withMetadata = (typeof withMetadata === 'boolean') ? withMetadata : true;
-  if (typeof withMetadata === 'object') {
-    if ('orientation' in withMetadata) {
-      if (
-        typeof withMetadata.orientation === 'number' &&
-        !Number.isNaN(withMetadata.orientation) &&
-        withMetadata.orientation % 1 === 0 &&
-        withMetadata.orientation >= 1 &&
-        withMetadata.orientation <= 8
-      ) {
+  this.options.withMetadata = isBoolean(withMetadata) ? withMetadata : true;
+  if (isObject(withMetadata)) {
+    if (isDefined(withMetadata.orientation)) {
+      if (isInteger(withMetadata.orientation) && inRange(withMetadata.orientation, 1, 8)) {
        this.options.withMetadataOrientation = withMetadata.orientation;
      } else {
        throw new Error('Invalid orientation (1 to 8) ' + withMetadata.orientation);
@@ -703,6 +843,21 @@ module.exports.interpolator = {
  vsqbs: 'vsqbs',
  vertexSplitQuadraticBasisSpline: 'vsqbs'
 };
+// Boolean operations for bandbool
+module.exports.bool = {
+  and: 'and',
+  or: 'or',
+  eor: 'eor'
+};
+// Colourspaces
+module.exports.colourspace = {
+  multiband: 'multiband',
+  'b-w': 'b-w',
+  bw: 'b-w',
+  cmyk: 'cmyk',
+  srgb: 'srgb'
+};
+module.exports.colorspace = module.exports.colourspace;

 /*
  Resize image to width x height pixels
@@ -748,13 +903,6 @@ Sharp.prototype.resize = function(width, height, options) {
  }
  return this;
 };
-Sharp.prototype.interpolateWith = util.deprecate(function(interpolator) {
-  return this.resize(
-    this.options.width > 0 ? this.options.width : null,
-    this.options.height > 0 ? this.options.height : null,
-    { interpolator: interpolator }
-  );
-}, 'interpolateWith: Please use resize(w, h, { interpolator: ... }) instead');

 /*
  Limit the total number of pixels for input images
@@ -788,7 +936,7 @@ Sharp.prototype.toFile = function(fileOut, callback) {
      return BluebirdPromise.reject(errOutputInvalid);
    }
  } else {
-    if (this.options.fileIn === fileOut) {
+    if (this.options.input.file === fileOut) {
      var errOutputIsInput = new Error('Cannot use same file for input and output');
      if (typeof callback === 'function') {
        callback(errOutputIsInput);
@@ -847,12 +995,11 @@ Sharp.prototype.raw = function() {
  @param format is either the id as a String or an Object with an 'id' attribute
 */
 Sharp.prototype.toFormat = function(formatOut) {
-  if (isObject(formatOut) && isDefined(formatOut.id)) {
-    formatOut = formatOut.id;
-  }
-  if (
-    isDefined(formatOut) &&
-    ['jpeg', 'png', 'webp', 'raw', 'tiff', 'dz', 'input'].indexOf(formatOut) !== -1
+  if (isObject(formatOut) && isString(formatOut.id)) {
+    this.options.formatOut = formatOut.id;
+  } else if (
+    isString(formatOut) &&
+    contains(formatOut, ['jpeg', 'png', 'webp', 'raw', 'tiff', 'dz', 'input'])
  ) {
    this.options.formatOut = formatOut;
  } else {
@@ -879,9 +1026,10 @@ Sharp.prototype._pipeline = function(callback) {
  var that = this;
  if (typeof callback === 'function') {
    // output=file/buffer
-    if (this.options.streamIn) {
+    if (this._isStreamInput()) {
      // output=file/buffer, input=stream
      this.on('finish', function() {
+        that._flattenBufferIn();
        sharp.pipeline(that.options, callback);
      });
    } else {
@@ -891,9 +1039,10 @@ Sharp.prototype._pipeline = function(callback) {
    return this;
  } else if (this.options.streamOut) {
    // output=stream
-    if (this.options.streamIn) {
+    if (this._isStreamInput()) {
      // output=stream, input=stream
      this.on('finish', function() {
+        that._flattenBufferIn();
        sharp.pipeline(that.options, function(err, data, info) {
          if (err) {
            that.emit('error', err);
@@ -919,10 +1068,11 @@ Sharp.prototype._pipeline = function(callback) {
    return this;
  } else {
    // output=promise
-    if (this.options.streamIn) {
+    if (this._isStreamInput()) {
      // output=promise, input=stream
      return new BluebirdPromise(function(resolve, reject) {
        that.on('finish', function() {
+          that._flattenBufferIn();
          sharp.pipeline(that.options, function(err, data) {
            if (err) {
              reject(err);
@@ -954,8 +1104,9 @@ Sharp.prototype._pipeline = function(callback) {
 Sharp.prototype.metadata = function(callback) {
  var that = this;
  if (typeof callback === 'function') {
-    if (this.options.streamIn) {
+    if (this._isStreamInput()) {
      this.on('finish', function() {
+        that._flattenBufferIn();
        sharp.metadata(that.options, callback);
      });
    } else {
@@ -963,9 +1114,10 @@ Sharp.prototype.metadata = function(callback) {
    }
    return this;
  } else {
-    if (this.options.streamIn) {
+    if (this._isStreamInput()) {
      return new BluebirdPromise(function(resolve, reject) {
        that.on('finish', function() {
+          that._flattenBufferIn();
          sharp.metadata(that.options, function(err, metadata) {
            if (err) {
              reject(err);
@@ -994,13 +1146,15 @@ Sharp.prototype.metadata = function(callback) {
  Cloned instances share the same input.
 */
 Sharp.prototype.clone = function() {
+  var that = this;
  // Clone existing options
  var clone = new Sharp();
  util._extend(clone.options, this.options);
  // Pass 'finish' event to clone for Stream-based input
  this.on('finish', function() {
    // Clone inherits input data
-    clone.options.bufferIn = this.options.bufferIn;
+    that._flattenBufferIn();
+    clone.options.bufferIn = that.options.bufferIn;
    clone.emit('finish');
  });
  return clone;
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -1,7 +1,7 @@
 site_name: sharp
 site_url: http://sharp.dimens.io/
 repo_url: https://github.com/lovell/sharp
-site_description: The fastest Node.js module for resizing JPEG, PNG, WebP and TIFF images. Uses the libvips library.
+site_description: High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP and TIFF images
 copyright: <a href="https://dimens.io/">dimens.io</a>
 google_analytics: ['UA-13034748-12', 'sharp.dimens.io']
 theme: readthedocs
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "sharp",
-  "version": "0.15.0",
+  "version": "0.16.2",
  "author": "Lovell Fuller <npm@lovell.info>",
  "contributors": [
    "Pierre Inglebert <pierre.inglebert@gmail.com>",
@@ -22,7 +22,12 @@
    "John Tobin <john@limelightmobileinc.com>",
    "Kenton Gray <kentongray@gmail.com>",
    "Felix Bünemann <Felix.Buenemann@gmail.com>",
-    "Samy Al Zahrani <samyalzahrany@gmail.com>"
+    "Samy Al Zahrani <samyalzahrany@gmail.com>",
+    "Chintan Thakkar <lemnisk8@gmail.com>",
+    "F. Orlando Galashan <frulo@gmx.de>",
+    "Kleis Auke Wolthuizen <info@kleisauke.nl>",
+    "Matt Hirsch <mhirsch@media.mit.edu>",
+    "Matthias Thoemmes <thoemmes@gmail.com>"
  ],
  "description": "High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP and TIFF images",
  "scripts": {
@@ -30,7 +35,7 @@
    "test": "VIPS_WARNING=0 node ./node_modules/istanbul/lib/cli.js cover ./node_modules/mocha/bin/_mocha -- --slow=5000 --timeout=30000 ./test/unit/*.js",
    "test-win": "node ./node_modules/mocha/bin/mocha --slow=5000 --timeout=60000 ./test/unit/*.js",
    "test-leak": "./test/leak/leak.sh",
-    "test-packaging": "./packaging/test.sh",
+    "test-packaging": "./packaging/test-linux-x64.sh",
    "test-clean": "rm -rf coverage/ test/fixtures/output.* && npm install && npm test"
  },
  "main": "index.js",
@@ -54,29 +59,29 @@
    "vips"
  ],
  "dependencies": {
-    "bluebird": "^3.3.5",
-    "color": "^0.11.1",
-    "nan": "^2.2.1",
-    "semver": "^5.1.0",
-    "request": "^2.71.0",
+    "bluebird": "^3.4.6",
+    "color": "^0.11.3",
+    "nan": "^2.4.0",
+    "semver": "^5.3.0",
+    "request": "^2.75.0",
    "tar": "^2.2.1"
  },
  "devDependencies": {
-    "async": "^1.5.2",
+    "async": "^2.1.2",
    "bufferutil": "^1.2.1",
-    "coveralls": "^2.11.9",
-    "exif-reader": "^1.0.0",
+    "coveralls": "^2.11.14",
+    "exif-reader": "^1.0.1",
    "icc": "^0.0.2",
-    "istanbul": "^0.4.3",
-    "mocha": "^2.4.5",
+    "istanbul": "^0.4.5",
+    "mocha": "^3.1.2",
    "mocha-jshint": "^2.3.1",
    "node-cpplint": "^0.4.0",
-    "rimraf": "^2.5.2",
+    "rimraf": "^2.5.4",
    "unzip": "^0.1.11"
  },
  "license": "Apache-2.0",
  "config": {
-    "libvips": "8.3.1"
+    "libvips": "8.3.3"
  },
  "engines": {
    "node": ">=0.10"
--- a/packaging/README.md
+++ b/packaging/README.md
@@ -0,0 +1,57 @@
+# Packaging scripts
+
+libvips and its dependencies are provided as pre-compiled shared libraries
+for the most common operating systems and CPU architectures.
+
+During `npm install`, these binaries are fetched as tarballs from
+[Bintray](https://dl.bintray.com/lovell/sharp/) via HTTPS
+and stored locally within `node_modules/sharp`.
+
+## Using a custom tarball
+
+A custom tarball stored on the local filesystem can be used instead.
+Place it in the following location, where `x.y.z` is the libvips version,
+`platform` is the value of `process.platform` and
+`arch` is the value of `process.arch` (plus the version number for ARM).
+
+`node_modules/sharp/packaging/libvips-x.y.z-platform-arch.tar.gz`
+
+For example, for libvips v8.3.3 on an ARMv6 Linux machine, use:
+
+`node_modules/sharp/packaging/libvips-8.3.3-linux-armv6.tar.gz`
+
+Remove any `sharp/lib` and `sharp/include` directories
+before running `npm install` again.
+
+## Creating a tarball
+
+Most people will not need to do this; proceed with caution.
+
+The `packaging` directory contains the top-level [build script](build.sh).
+
+### Linux
+
+One [build script](build/lin.sh) is used to (cross-)compile
+the same shared libraries within multiple containers.
+
+* [x64](linux-x64/Dockerfile)
+* [ARMv6](linux-armv6/Dockerfile)
+* [ARMv7-A](linux-armv7/Dockerfile)
+* [ARMv8-A](linux-armv8/Dockerfile)
+
+The QEMU user mode emulation binaries are required to build for
+the ARMv6 platform as the Debian armhf cross-compiler erroneously
+generates unsupported Thumb 2 instructions.
+
+```sh
+sudo apt-get install qemu-user-static
+```
+
+### Windows
+
+The output of libvips' [build-win64](https://github.com/jcupitt/build-win64)
+"web" target is [post-processed](build/win.sh) within a [container](win32-x64/Dockerfile).
+
+### OS X
+
+See [package-libvips-darwin](https://github.com/lovell/package-libvips-darwin).
--- a/packaging/arm-build.sh
+++ b/packaging/arm-build.sh
@@ -1,34 +0,0 @@
-#!/bin/sh
-
-if [ $# -lt 1 ]; then
-  echo "Usage: $0 IP"
-  echo "Build libvips for ARM using Docker, where IP is"
-  echo "the address of a Raspberry Pi running HypriotOS"
-  exit 1
-fi
-IP="$1"
-
-echo "Verifying connectivity to $IP"
-if ! ping -c 1 $IP; then
-  echo "Could not connect to $IP"
-  exit 1
-fi
-
-if ! type sshpass >/dev/null; then
-  echo "Please install sshpass"
-  exit 1
-fi
-
-export SSHPASS=hypriot
-
-echo "Copying arm/Dockerfile and arm/build.sh to device"
-sshpass -e scp -o PreferredAuthentications=password -r arm root@${IP}:/root
-
-echo "Building Raspbian-based container"
-sshpass -e ssh -o PreferredAuthentications=password -t root@${IP} "docker build -t vips-dev-arm arm"
-
-echo "Running arm/build.sh within container"
-sshpass -e ssh -o PreferredAuthentications=password -t root@${IP} "docker run -i -t --rm -v \${PWD}/arm:/arm vips-dev-arm sh -c 'cd /arm && ./build.sh' | tee arm/build.log"
-
-echo "Copying resultant tar.gz file from device"
-sshpass -e scp -o PreferredAuthentications=password root@${IP}:/root/arm/*.tar.gz .
--- a/packaging/arm/Dockerfile
+++ b/packaging/arm/Dockerfile
@@ -1,5 +0,0 @@
-FROM resin/rpi-raspbian:jessie
-MAINTAINER Lovell Fuller <npm@lovell.info>
-
-# Build dependencies
-RUN apt-get update && apt-get install -y build-essential autoconf libtool nasm gtk-doc-tools texinfo curl
--- a/packaging/build.sh
+++ b/packaging/build.sh
@@ -1,30 +1,43 @@
 #!/bin/sh
+set -e

-VERSION_VIPS=8.3.1
+if [ $# -lt 1 ]; then
+  echo
+  echo "Usage: $0 VERSION [PLATFORM]"
+  echo "Build shared libraries for libvips and its dependencies via containers"
+  echo
+  echo "Please specify the libvips VERSION, e.g. 8.3.3"
+  echo
+  echo "Optionally build for only one PLATFORM, defaults to building for all"
+  echo "Possible values for PLATFORM are: win32-x64, linux-x64, linux-armv6,"
+  echo "linux-armv7, linux-armv8"
+  echo
+  exit 1
+fi
+VERSION_VIPS="$1"
+PLATFORM="${2:-all}"

 # Is docker available?
-
 if ! type docker >/dev/null; then
  echo "Please install docker"
  exit 1
 fi

-# TODO: docker v1.9.0 allows build-time args - https://github.com/docker/docker/pull/15182
+# Windows (x64)
+if [ $PLATFORM = "all" ] || [ $PLATFORM = "win32-x64" ]; then
+  echo "Building win32-x64..."
+  docker build -t vips-dev-win32-x64 win32-x64
+  docker run --rm -e "VERSION_VIPS=${VERSION_VIPS}" -v $PWD:/packaging vips-dev-win32-x64 sh -c "/packaging/build/win.sh"
+fi

-# Windows
-
-docker build -t vips-dev-win win
-WIN_CONTAINER_ID=$(docker run -d vips-dev-win)
-docker cp "${WIN_CONTAINER_ID}:/libvips-${VERSION_VIPS}-win.tar.gz" .
-docker rm "${WIN_CONTAINER_ID}"
-
-# Linux
-
-docker build -t vips-dev-lin lin
-LIN_CONTAINER_ID=$(docker run -d vips-dev-lin)
-docker cp "${LIN_CONTAINER_ID}:/libvips-${VERSION_VIPS}-lin.tar.gz" .
-docker rm "${LIN_CONTAINER_ID}"
-
-# Checksums
+# Linux (x64, ARMv6, ARMv7, ARMv8)
+for flavour in linux-x64 linux-armv6 linux-armv7 linux-armv8; do
+  if [ $PLATFORM = "all" ] || [ $PLATFORM = $flavour ]; then
+    echo "Building $flavour..."
+    docker build -t vips-dev-$flavour $flavour
+    docker run --rm -e "VERSION_VIPS=${VERSION_VIPS}" -v $PWD:/packaging vips-dev-$flavour sh -c "/packaging/build/lin.sh"
+  fi
+done

+# Display checksums
 sha256sum *.tar.gz
--- a/packaging/build/lin.sh
+++ b/packaging/build/lin.sh
@@ -1,6 +1,5 @@
 #!/bin/sh
-
-# To be run inside a Raspbian container
+set -e

 # Working directories
 DEPS=/deps
@@ -13,33 +12,32 @@ export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:${TARGET}/lib/pkgconfig"
 export PATH="${PATH}:${TARGET}/bin"
 export CPPFLAGS="-I${TARGET}/include"
 export LDFLAGS="-L${TARGET}/lib"
-export CFLAGS="-O3"
-export CXXFLAGS="-O3"
+export CFLAGS="${FLAGS}"
+export CXXFLAGS="${FLAGS}"

 # Dependency version numbers
 VERSION_ZLIB=1.2.8
 VERSION_FFI=3.2.1
-VERSION_GLIB=2.48.0
-VERSION_XML2=2.9.3
-VERSION_GSF=1.14.36
+VERSION_GLIB=2.49.4
+VERSION_XML2=2.9.4
+VERSION_GSF=1.14.39
 VERSION_EXIF=0.6.21
-VERSION_LCMS2=2.7
-VERSION_JPEG=1.4.90
-VERSION_PNG16=1.6.21
-VERSION_WEBP=0.5.0
+VERSION_LCMS2=2.8
+VERSION_JPEG=1.5.0
+VERSION_PNG16=1.6.25
+VERSION_WEBP=0.5.1
 VERSION_TIFF=4.0.6
 VERSION_ORC=0.4.25
-VERSION_GDKPIXBUF=2.34.0
-VERSION_FREETYPE=2.6.3
-VERSION_FONTCONFIG=2.11.95
-VERSION_HARFBUZZ=1.2.6
+VERSION_GDKPIXBUF=2.35.2
+VERSION_FREETYPE=2.6.5
+VERSION_FONTCONFIG=2.12.0
+VERSION_HARFBUZZ=1.3.0
 VERSION_PIXMAN=0.34.0
 VERSION_CAIRO=1.14.6
 VERSION_PANGO=1.40.1
 VERSION_CROCO=0.6.11
-VERSION_SVG=2.40.15
+VERSION_SVG=2.40.16
 VERSION_GIF=5.1.4
-VERSION_VIPS=8.3.1

 # Least out-of-sync Sourceforge mirror
 SOURCEFORGE_MIRROR=netix
@@ -47,131 +45,157 @@ SOURCEFORGE_MIRROR=netix
 mkdir ${DEPS}/zlib
 curl -Ls http://zlib.net/zlib-${VERSION_ZLIB}.tar.xz | tar xJC ${DEPS}/zlib --strip-components=1
 cd ${DEPS}/zlib
-./configure --prefix=${TARGET} && make install
+./configure --prefix=${TARGET} --uname=linux
+make install
 rm ${TARGET}/lib/libz.a

 mkdir ${DEPS}/ffi
 curl -Ls ftp://sourceware.org/pub/libffi/libffi-${VERSION_FFI}.tar.gz | tar xzC ${DEPS}/ffi --strip-components=1
 cd ${DEPS}/ffi
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-builddir && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-builddir
+make install-strip

 mkdir ${DEPS}/glib
-curl -Ls https://download.gnome.org/sources/glib/2.48/glib-${VERSION_GLIB}.tar.xz | tar xJC ${DEPS}/glib --strip-components=1
+curl -Ls https://download.gnome.org/sources/glib/2.49/glib-${VERSION_GLIB}.tar.xz | tar xJC ${DEPS}/glib --strip-components=1
 cd ${DEPS}/glib
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --with-pcre=internal && make install-strip
+echo glib_cv_stack_grows=no >>glib.cache
+echo glib_cv_uscore=no >>glib.cache
+./configure --cache-file=glib.cache --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --with-pcre=internal
+make install-strip

 mkdir ${DEPS}/xml2
 curl -Ls http://xmlsoft.org/sources/libxml2-${VERSION_XML2}.tar.gz | tar xzC ${DEPS}/xml2 --strip-components=1
 cd ${DEPS}/xml2
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --without-python --with-zlib=${TARGET} && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
+  --without-python --without-debug --without-docbook --without-ftp --without-html --without-legacy \
+  --without-pattern --without-push --without-regexps --without-schemas --without-schematron --with-zlib=${TARGET}
+make install-strip

 mkdir ${DEPS}/gsf
 curl -Ls https://download.gnome.org/sources/libgsf/1.14/libgsf-${VERSION_GSF}.tar.xz | tar xJC ${DEPS}/gsf --strip-components=1
 cd ${DEPS}/gsf
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
+make install-strip

 mkdir ${DEPS}/exif
 curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/libexif/libexif/${VERSION_EXIF}/libexif-${VERSION_EXIF}.tar.bz2 | tar xjC ${DEPS}/exif --strip-components=1
 cd ${DEPS}/exif
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+autoreconf -fiv
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
+make install-strip

 mkdir ${DEPS}/lcms2
 curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/lcms/lcms/${VERSION_LCMS2}/lcms2-${VERSION_LCMS2}.tar.gz | tar xzC ${DEPS}/lcms2 --strip-components=1
 cd ${DEPS}/lcms2
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
+make install-strip

 mkdir ${DEPS}/jpeg
 curl -Ls https://github.com/libjpeg-turbo/libjpeg-turbo/archive/${VERSION_JPEG}.tar.gz | tar xzC ${DEPS}/jpeg --strip-components=1
 cd ${DEPS}/jpeg
-autoreconf -fiv && ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --with-jpeg8 --without-turbojpeg && make install-strip
+autoreconf -fiv
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --with-jpeg8 --without-turbojpeg
+make install-strip

 mkdir ${DEPS}/png16
 curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/libpng/libpng16/${VERSION_PNG16}/libpng-${VERSION_PNG16}.tar.xz | tar xJC ${DEPS}/png16 --strip-components=1
 cd ${DEPS}/png16
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
+make install-strip

 mkdir ${DEPS}/webp
 curl -Ls http://downloads.webmproject.org/releases/webp/libwebp-${VERSION_WEBP}.tar.gz | tar xzC ${DEPS}/webp --strip-components=1
 cd ${DEPS}/webp
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-neon
+make install-strip

 mkdir ${DEPS}/tiff
 curl -Ls http://download.osgeo.org/libtiff/tiff-${VERSION_TIFF}.tar.gz | tar xzC ${DEPS}/tiff --strip-components=1
 cd ${DEPS}/tiff
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-rm ${TARGET}/lib/libtiffxx*
+if [ -n "${CHOST}" ]; then autoreconf -fiv; fi
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-mdi --disable-cxx
+make install-strip

 mkdir ${DEPS}/orc
 curl -Ls http://gstreamer.freedesktop.org/data/src/orc/orc-${VERSION_ORC}.tar.xz | tar xJC ${DEPS}/orc --strip-components=1
 cd ${DEPS}/orc
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
+make install-strip
+cd ${TARGET}/lib
+rm -rf liborc-test-*

 mkdir ${DEPS}/gdkpixbuf
-curl -Ls https://download.gnome.org/sources/gdk-pixbuf/2.34/gdk-pixbuf-${VERSION_GDKPIXBUF}.tar.xz | tar xJC ${DEPS}/gdkpixbuf --strip-components=1
+curl -Ls https://download.gnome.org/sources/gdk-pixbuf/2.35/gdk-pixbuf-${VERSION_GDKPIXBUF}.tar.xz | tar xJC ${DEPS}/gdkpixbuf --strip-components=1
 cd ${DEPS}/gdkpixbuf
-LD_LIBRARY_PATH=${TARGET}/lib ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
-  --disable-introspection --disable-modules --without-libpng --without-libjpeg --without-libtiff --without-gdiplus --with-included-loaders= \
-  && make install-strip
+LD_LIBRARY_PATH=${TARGET}/lib \
+./configure --cache-file=gdkpixbuf.cache --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-introspection --disable-modules --disable-gio-sniffing --without-libpng --without-libjpeg --without-libtiff --without-gdiplus --with-included-loaders=
+make install-strip

 mkdir ${DEPS}/freetype
-curl -Ls http://download.savannah.gnu.org/releases/freetype/freetype-${VERSION_FREETYPE}.tar.gz | tar xzC ${DEPS}/freetype --strip-components=1
+curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/freetype/freetype2/${VERSION_FREETYPE}/freetype-${VERSION_FREETYPE}.tar.gz | tar xzC ${DEPS}/freetype --strip-components=1
 cd ${DEPS}/freetype
-./configure --prefix=${TARGET} --enable-shared --disable-static && make install
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static
+make install

 mkdir ${DEPS}/fontconfig
 curl -Ls https://www.freedesktop.org/software/fontconfig/release/fontconfig-${VERSION_FONTCONFIG}.tar.bz2 | tar xjC ${DEPS}/fontconfig --strip-components=1
 cd ${DEPS}/fontconfig
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --enable-libxml2 && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --enable-libxml2
+make install-strip

 mkdir ${DEPS}/harfbuzz
 curl -Ls https://www.freedesktop.org/software/harfbuzz/release/harfbuzz-${VERSION_HARFBUZZ}.tar.bz2 | tar xjC ${DEPS}/harfbuzz --strip-components=1
 cd ${DEPS}/harfbuzz
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
+make install-strip

 mkdir ${DEPS}/pixman
 curl -Ls http://cairographics.org/releases/pixman-${VERSION_PIXMAN}.tar.gz | tar xzC ${DEPS}/pixman --strip-components=1
 cd ${DEPS}/pixman
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-libpng --disable-arm-iwmmxt && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-libpng --disable-arm-iwmmxt
+make install-strip

 mkdir ${DEPS}/cairo
 curl -Ls http://cairographics.org/releases/cairo-${VERSION_CAIRO}.tar.xz | tar xJC ${DEPS}/cairo --strip-components=1
 cd ${DEPS}/cairo
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
  --disable-xlib --disable-xcb --disable-quartz --disable-win32 --disable-egl --disable-glx --disable-wgl \
-  --disable-script --disable-ps --disable-gobject --disable-trace --disable-interpreter \
-  && make install-strip
+  --disable-script --disable-ps --disable-gobject --disable-trace --disable-interpreter
+make install-strip

 mkdir ${DEPS}/pango
 curl -Ls https://download.gnome.org/sources/pango/1.40/pango-${VERSION_PANGO}.tar.xz | tar xJC ${DEPS}/pango --strip-components=1
 cd ${DEPS}/pango
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
+make install-strip

 mkdir ${DEPS}/croco
 curl -Ls https://download.gnome.org/sources/libcroco/0.6/libcroco-${VERSION_CROCO}.tar.xz | tar xJC ${DEPS}/croco --strip-components=1
 cd ${DEPS}/croco
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
+make install-strip

 mkdir ${DEPS}/svg
 curl -Ls https://download.gnome.org/sources/librsvg/2.40/librsvg-${VERSION_SVG}.tar.xz | tar xJC ${DEPS}/svg --strip-components=1
 cd ${DEPS}/svg
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
-  --disable-introspection --disable-tools \
-  && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-introspection --disable-tools --disable-pixbuf-loader
+make install-strip

 mkdir ${DEPS}/gif
 curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/giflib/giflib-${VERSION_GIF}.tar.gz | tar xzC ${DEPS}/gif --strip-components=1
 cd ${DEPS}/gif
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking
+make install-strip

 mkdir ${DEPS}/vips
 curl -Ls http://www.vips.ecs.soton.ac.uk/supported/8.3/vips-${VERSION_VIPS}.tar.gz | tar xzC ${DEPS}/vips --strip-components=1
 cd ${DEPS}/vips
-./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
+./configure --host=${CHOST} --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
  --disable-debug --disable-introspection --without-python --without-fftw \
  --without-magick --without-pangoft2 --without-ppm --without-analyze --without-radiance \
  --with-zip-includes=${TARGET}/include --with-zip-libraries=${TARGET}/lib \
-  --with-jpeg-includes=${TARGET}/include --with-jpeg-libraries=${TARGET}/lib \
-  && make install-strip
+  --with-jpeg-includes=${TARGET}/include --with-jpeg-libraries=${TARGET}/lib
+make install-strip

 # Remove the old C++ bindings
 cd ${TARGET}/include
@@ -208,4 +232,5 @@ echo "{\n\
 }" >lib/versions.json

 # Create .tar.gz
-GZIP=-9 tar czf /arm/libvips-${VERSION_VIPS}-arm.tar.gz include lib
+tar czf /packaging/libvips-${VERSION_VIPS}-${PLATFORM}.tar.gz include lib
+advdef --recompress --shrink-insane /packaging/libvips-${VERSION_VIPS}-${PLATFORM}.tar.gz
--- a/packaging/build/win.sh
+++ b/packaging/build/win.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+set -e
+
+# Fetch and unzip
+mkdir /vips
+cd /vips
+curl -L -O https://github.com/lovell/build-win64/releases/download/v${VERSION_VIPS}/vips-dev-w64-web-${VERSION_VIPS}.zip
+unzip vips-dev-w64-web-${VERSION_VIPS}.zip
+
+# Clean and zip
+cd /vips/vips-dev-8.3
+rm bin/libvipsCC-42.dll bin/libvips-cpp-42.dll bin/libgsf-win32-1-114.dll
+cp bin/*.dll lib/
+cp -r lib64/* lib/
+
+echo "Creating tarball"
+tar czf /packaging/libvips-${VERSION_VIPS}-${PLATFORM}.tar.gz include lib/glib-2.0 lib/libvips.lib lib/libglib-2.0.lib lib/libgobject-2.0.lib lib/*.dll
+echo "Shrinking tarball"
+advdef --recompress --shrink-insane /packaging/libvips-${VERSION_VIPS}-${PLATFORM}.tar.gz
--- a/packaging/lin/Dockerfile
+++ b/packaging/lin/Dockerfile
@@ -1,221 +0,0 @@
-FROM debian:wheezy
-MAINTAINER Lovell Fuller <npm@lovell.info>
-
-# Build dependencies
-RUN apt-get update && apt-get install -y build-essential autoconf libtool nasm gtk-doc-tools texinfo
-
-# Create working directories
-ENV DEPS=/deps \
-    TARGET=/target
-RUN mkdir ${DEPS} && mkdir ${TARGET}
-
-# Common build paths and flags
-ENV PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:${TARGET}/lib/pkgconfig" \
-    PATH="${PATH}:${TARGET}/bin" \
-    CPPFLAGS="-I${TARGET}/include" \
-    LDFLAGS="-L${TARGET}/lib" \
-    CFLAGS="-O3" \
-    CXXFLAGS="-O3"
-
-# Dependency version numbers
-ENV VERSION_ZLIB=1.2.8 \
-    VERSION_FFI=3.2.1 \
-    VERSION_GLIB=2.48.0 \
-    VERSION_XML2=2.9.3 \
-    VERSION_GSF=1.14.36 \
-    VERSION_EXIF=0.6.21 \
-    VERSION_LCMS2=2.7 \
-    VERSION_JPEG=1.4.90 \
-    VERSION_PNG16=1.6.21 \
-    VERSION_WEBP=0.5.0 \
-    VERSION_TIFF=4.0.6 \
-    VERSION_ORC=0.4.25 \
-    VERSION_GDKPIXBUF=2.34.0 \
-    VERSION_FREETYPE=2.6.3 \
-    VERSION_FONTCONFIG=2.11.95 \
-    VERSION_HARFBUZZ=1.2.6 \
-    VERSION_PIXMAN=0.34.0 \
-    VERSION_CAIRO=1.14.6 \
-    VERSION_PANGO=1.40.1 \
-    VERSION_CROCO=0.6.11 \
-    VERSION_SVG=2.40.15 \
-    VERSION_GIF=5.1.4 \
-    VERSION_VIPS=8.3.1
-
-# Least out-of-sync Sourceforge mirror
-ENV SOURCEFORGE_MIRROR=netix
-
-RUN mkdir ${DEPS}/zlib
-RUN curl -Ls http://zlib.net/zlib-${VERSION_ZLIB}.tar.xz | tar xJC ${DEPS}/zlib --strip-components=1
-WORKDIR ${DEPS}/zlib
-RUN ./configure --prefix=${TARGET} && make install
-RUN rm ${TARGET}/lib/libz.a
-
-RUN mkdir ${DEPS}/ffi
-RUN curl -Ls ftp://sourceware.org/pub/libffi/libffi-${VERSION_FFI}.tar.gz | tar xzC ${DEPS}/ffi --strip-components=1
-WORKDIR ${DEPS}/ffi
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-builddir && make install-strip
-
-RUN mkdir ${DEPS}/glib
-RUN curl -Ls https://download.gnome.org/sources/glib/2.48/glib-${VERSION_GLIB}.tar.xz | tar xJC ${DEPS}/glib --strip-components=1
-WORKDIR ${DEPS}/glib
-RUN CFLAGS="${CFLAGS} -Wl,--default-symver" CXXFLAGS="${CXXFLAGS} -Wl,--default-symver" \
-  ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --with-pcre=internal && make install-strip
-
-RUN mkdir ${DEPS}/xml2
-RUN curl -Ls http://xmlsoft.org/sources/libxml2-${VERSION_XML2}.tar.gz | tar xzC ${DEPS}/xml2 --strip-components=1
-WORKDIR ${DEPS}/xml2
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
-  --without-python --without-debug --without-docbook --without-ftp --without-html --without-legacy \
-  --without-pattern --without-push --without-regexps --without-schemas --without-schematron --with-zlib=${TARGET} \
-  && make install-strip
-
-RUN mkdir ${DEPS}/gsf
-RUN curl -Ls https://download.gnome.org/sources/libgsf/1.14/libgsf-${VERSION_GSF}.tar.xz | tar xJC ${DEPS}/gsf --strip-components=1
-WORKDIR ${DEPS}/gsf
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-
-RUN mkdir ${DEPS}/exif
-RUN curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/libexif/libexif/${VERSION_EXIF}/libexif-${VERSION_EXIF}.tar.bz2 | tar xjC ${DEPS}/exif --strip-components=1
-WORKDIR ${DEPS}/exif
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-
-RUN mkdir ${DEPS}/lcms2
-RUN curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/lcms/lcms/${VERSION_LCMS2}/lcms2-${VERSION_LCMS2}.tar.gz | tar xzC ${DEPS}/lcms2 --strip-components=1
-WORKDIR ${DEPS}/lcms2
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-
-RUN mkdir ${DEPS}/jpeg
-RUN curl -Ls https://github.com/libjpeg-turbo/libjpeg-turbo/archive/${VERSION_JPEG}.tar.gz | tar xzC ${DEPS}/jpeg --strip-components=1
-WORKDIR ${DEPS}/jpeg
-RUN autoreconf -fiv && ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --with-jpeg8 --without-turbojpeg && make install-strip
-
-RUN mkdir ${DEPS}/png16
-RUN curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/libpng/libpng16/${VERSION_PNG16}/libpng-${VERSION_PNG16}.tar.xz | tar xJC ${DEPS}/png16 --strip-components=1
-WORKDIR ${DEPS}/png16
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-
-RUN mkdir ${DEPS}/webp
-RUN curl -Ls http://downloads.webmproject.org/releases/webp/libwebp-${VERSION_WEBP}.tar.gz | tar xzC ${DEPS}/webp --strip-components=1
-WORKDIR ${DEPS}/webp
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-
-RUN mkdir ${DEPS}/tiff
-RUN curl -Ls http://download.osgeo.org/libtiff/tiff-${VERSION_TIFF}.tar.gz | tar xzC ${DEPS}/tiff --strip-components=1
-WORKDIR ${DEPS}/tiff
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-RUN rm ${TARGET}/lib/libtiffxx*
-
-RUN mkdir ${DEPS}/orc
-RUN curl -Ls http://gstreamer.freedesktop.org/data/src/orc/orc-${VERSION_ORC}.tar.xz | tar xJC ${DEPS}/orc --strip-components=1
-WORKDIR ${DEPS}/orc
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-RUN rm ${TARGET}/lib/liborc-test-*
-
-RUN mkdir ${DEPS}/gdkpixbuf
-RUN curl -Ls https://download.gnome.org/sources/gdk-pixbuf/2.34/gdk-pixbuf-${VERSION_GDKPIXBUF}.tar.xz | tar xJC ${DEPS}/gdkpixbuf --strip-components=1
-WORKDIR ${DEPS}/gdkpixbuf
-RUN LD_LIBRARY_PATH=${TARGET}/lib ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
-  --disable-introspection --disable-modules --without-libpng --without-libjpeg --without-libtiff --without-gdiplus --with-included-loaders= \
-  && make install-strip
-
-RUN mkdir ${DEPS}/freetype
-RUN curl -Ls http://download.savannah.gnu.org/releases/freetype/freetype-${VERSION_FREETYPE}.tar.gz | tar xzC ${DEPS}/freetype --strip-components=1
-WORKDIR ${DEPS}/freetype
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static && make install
-
-RUN mkdir ${DEPS}/fontconfig
-RUN curl -Ls https://www.freedesktop.org/software/fontconfig/release/fontconfig-${VERSION_FONTCONFIG}.tar.bz2 | tar xjC ${DEPS}/fontconfig --strip-components=1
-WORKDIR ${DEPS}/fontconfig
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --enable-libxml2 && make install-strip
-
-RUN mkdir ${DEPS}/harfbuzz
-RUN curl -Ls https://www.freedesktop.org/software/harfbuzz/release/harfbuzz-${VERSION_HARFBUZZ}.tar.bz2 | tar xjC ${DEPS}/harfbuzz --strip-components=1
-WORKDIR ${DEPS}/harfbuzz
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-
-RUN mkdir ${DEPS}/pixman
-RUN curl -Ls http://cairographics.org/releases/pixman-${VERSION_PIXMAN}.tar.gz | tar xzC ${DEPS}/pixman --strip-components=1
-WORKDIR ${DEPS}/pixman
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking --disable-libpng && make install-strip
-
-RUN mkdir ${DEPS}/cairo
-RUN curl -Ls http://cairographics.org/releases/cairo-${VERSION_CAIRO}.tar.xz | tar xJC ${DEPS}/cairo --strip-components=1
-WORKDIR ${DEPS}/cairo
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
-  --disable-xlib --disable-xcb --disable-quartz --disable-win32 --disable-egl --disable-glx --disable-wgl \
-  --disable-script --disable-ps --disable-gobject --disable-trace --disable-interpreter \
-  && make install-strip
-
-RUN mkdir ${DEPS}/pango
-RUN curl -Ls https://download.gnome.org/sources/pango/1.40/pango-${VERSION_PANGO}.tar.xz | tar xJC ${DEPS}/pango --strip-components=1
-WORKDIR ${DEPS}/pango
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-
-RUN mkdir ${DEPS}/croco
-RUN curl -Ls https://download.gnome.org/sources/libcroco/0.6/libcroco-${VERSION_CROCO}.tar.xz | tar xJC ${DEPS}/croco --strip-components=1
-WORKDIR ${DEPS}/croco
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-
-RUN mkdir ${DEPS}/svg
-RUN curl -Ls https://download.gnome.org/sources/librsvg/2.40/librsvg-${VERSION_SVG}.tar.xz | tar xJC ${DEPS}/svg --strip-components=1
-WORKDIR ${DEPS}/svg
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
-  --disable-introspection --disable-tools \
-  && make install-strip
-
-RUN mkdir ${DEPS}/gif
-RUN curl -Ls http://${SOURCEFORGE_MIRROR}.dl.sourceforge.net/project/giflib/giflib-${VERSION_GIF}.tar.gz | tar xzC ${DEPS}/gif --strip-components=1
-WORKDIR ${DEPS}/gif
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking && make install-strip
-
-RUN mkdir ${DEPS}/vips
-RUN curl -Ls http://www.vips.ecs.soton.ac.uk/supported/8.3/vips-${VERSION_VIPS}.tar.gz | tar xzC ${DEPS}/vips --strip-components=1
-#RUN apt-get install -y swig gobject-introspection gettext glib2.0-dev
-#RUN curl -Ls https://github.com/jcupitt/libvips/archive/master.tar.gz | tar xzC ${DEPS}/vips --strip-components=1
-WORKDIR ${DEPS}/vips
-#RUN ./bootstrap.sh
-RUN ./configure --prefix=${TARGET} --enable-shared --disable-static --disable-dependency-tracking \
-  --disable-debug --disable-introspection --without-python --without-fftw \
-  --without-magick --without-pangoft2 --without-ppm --without-analyze --without-radiance \
-  --with-zip-includes=${TARGET}/include --with-zip-libraries=${TARGET}/lib \
-  --with-jpeg-includes=${TARGET}/include --with-jpeg-libraries=${TARGET}/lib \
-  && make install-strip
-
-# Remove the old C++ bindings
-WORKDIR ${TARGET}/include
-RUN rm -rf vips/vipsc++.h vips/vipscpp.h
-WORKDIR ${TARGET}/lib
-RUN rm -rf pkgconfig .libs *.la libvipsCC*
-
-# Create JSON file of version numbers
-WORKDIR ${TARGET}
-RUN echo "{\n\
-  \"cairo\": \"${VERSION_CAIRO}\",\n\
-  \"croco\": \"${VERSION_CROCO}\",\n\
-  \"exif\": \"${VERSION_EXIF}\",\n\
-  \"ffi\": \"${VERSION_FFI}\",\n\
-  \"fontconfig\": \"${VERSION_FONTCONFIG}\",\n\
-  \"freetype\": \"${VERSION_FREETYPE}\",\n\
-  \"gdkpixbuf\": \"${VERSION_GDKPIXBUF}\",\n\
-  \"gif\": \"${VERSION_GIF}\",\n\
-  \"glib\": \"${VERSION_GLIB}\",\n\
-  \"gsf\": \"${VERSION_GSF}\",\n\
-  \"harfbuzz\": \"${VERSION_HARFBUZZ}\",\n\
-  \"jpeg\": \"${VERSION_JPEG}\",\n\
-  \"lcms\": \"${VERSION_LCMS2}\",\n\
-  \"orc\": \"${VERSION_ORC}\",\n\
-  \"pango\": \"${VERSION_PANGO}\",\n\
-  \"pixman\": \"${VERSION_PIXMAN}\",\n\
-  \"png\": \"${VERSION_PNG16}\",\n\
-  \"svg\": \"${VERSION_SVG}\",\n\
-  \"tiff\": \"${VERSION_TIFF}\",\n\
-  \"vips\": \"${VERSION_VIPS}\",\n\
-  \"webp\": \"${VERSION_WEBP}\",\n\
-  \"xml\": \"${VERSION_XML2}\",\n\
-  \"zlib\": \"${VERSION_ZLIB}\"\n\
-}" >lib/versions.json
-
-# Create .tar.gz
-WORKDIR ${TARGET}
-RUN GZIP=-9 tar czf /libvips-${VERSION_VIPS}-lin.tar.gz include lib
--- a/packaging/linux-armv6/Dockerfile
+++ b/packaging/linux-armv6/Dockerfile
@@ -0,0 +1,15 @@
+FROM socialdefect/raspbian-jessie-core
+MAINTAINER Lovell Fuller <npm@lovell.info>
+
+# Create Rasbian-based container suitable for compiling Linux ARMv6 binaries
+# Requires the QEMU user mode emulation binaries on the host machine
+
+# Build dependencies
+RUN \
+  apt-get update && \
+  apt-get install -y build-essential curl autoconf libtool nasm gtk-doc-tools texinfo advancecomp libglib2.0-dev
+
+# Compiler settings
+ENV \
+  PLATFORM=linux-armv6 \
+  FLAGS="-Os"
--- a/packaging/linux-armv7/Dockerfile
+++ b/packaging/linux-armv7/Dockerfile
@@ -0,0 +1,20 @@
+FROM debian:jessie
+MAINTAINER Lovell Fuller <npm@lovell.info>
+
+# Create Debian-based container suitable for cross-compiling Linux ARMv7-A binaries
+
+# Build dependencies
+RUN \
+  apt-get update && \
+  apt-get install -y curl && \
+  echo "deb http://emdebian.org/tools/debian/ jessie main" | tee /etc/apt/sources.list.d/crosstools.list && \
+  curl http://emdebian.org/tools/debian/emdebian-toolchain-archive.key | apt-key add - && \
+  dpkg --add-architecture armhf && \
+  apt-get update && \
+  apt-get install -y crossbuild-essential-armhf autoconf libtool nasm gtk-doc-tools texinfo advancecomp libglib2.0-dev
+
+# Compiler settings
+ENV \
+  PLATFORM=linux-armv7 \
+  CHOST=arm-linux-gnueabihf \
+  FLAGS="-marm -march=armv7-a -mfpu=neon-vfpv4 -mfloat-abi=hard -Os"
--- a/packaging/linux-armv8/Dockerfile
+++ b/packaging/linux-armv8/Dockerfile
@@ -0,0 +1,18 @@
+FROM debian:stretch
+MAINTAINER Lovell Fuller <npm@lovell.info>
+
+# Create Debian-based container suitable for cross-compiling Linux ARMv8-A binaries
+
+# Build dependencies
+RUN \
+  apt-get update && \
+  apt-get install -y curl && \
+  dpkg --add-architecture arm64 && \
+  apt-get update && \
+  apt-get install -y crossbuild-essential-arm64 autoconf libtool nasm gtk-doc-tools texinfo advancecomp libglib2.0-dev
+
+# Compiler settings
+ENV \
+  PLATFORM=linux-armv8 \
+  CHOST=aarch64-linux-gnu \
+  FLAGS="-march=armv8-a -Os -D_GLIBCXX_USE_CXX11_ABI=0"
--- a/packaging/linux-x64/Dockerfile
+++ b/packaging/linux-x64/Dockerfile
@@ -0,0 +1,14 @@
+FROM debian:wheezy
+MAINTAINER Lovell Fuller <npm@lovell.info>
+
+# Create Debian-based container suitable for building Linux x64 binaries
+
+# Build dependencies
+RUN \
+  apt-get update && \
+  apt-get install -y build-essential autoconf libtool nasm gtk-doc-tools texinfo advancecomp
+
+# Compiler settings
+ENV \
+  PLATFORM="linux-x64" \
+  FLAGS="-O3"
--- a/packaging/test-linux-arm.sh
+++ b/packaging/test-linux-arm.sh
@@ -22,7 +22,7 @@ fi
 export SSHPASS=hypriot

 echo "Copying sharp source to device"
-sshpass -e scp -o PreferredAuthentications=password -r ../../sharp root@${IP}:/root/sharp
+sshpass -e scp -o PreferredAuthentications=password -r ../../sharp pirate@${IP}:/home/pirate/sharp

 echo "Compile and test within container"
-sshpass -e ssh -o PreferredAuthentications=password -t root@${IP} "docker run -i -t --rm -v \${PWD}/sharp:/s hypriot/rpi-node:5 sh -c 'cd /s && npm install --unsafe-perm && npm test'"
+sshpass -e ssh -o PreferredAuthentications=password -t pirate@${IP} "docker run --rm -v \${PWD}/sharp:/s hypriot/rpi-node:6 sh -c 'cd /s && npm install --unsafe-perm && npm test'"
--- a/packaging/test-linux-x64.sh
+++ b/packaging/test-linux-x64.sh
@@ -6,7 +6,7 @@ if ! type docker >/dev/null; then
  exit 1
 fi

-version_node=4.4.2
+version_node=6.3.0

 test="npm run clean; npm install --unsafe-perm; npm test"

@@ -23,15 +23,15 @@ done
 # Centos 7
 echo "Testing centos7..."
 if docker run -i -t --rm -v $PWD:/v -e "NODE_ENV=development" nodesource/centos7:$version_node >packaging/$dist.log 2>&1 sh -c "cd /v; $test";
-then echo "$dist OK"
-else echo "$dist fail" && cat packaging/$dist.log
+then echo "centos7 OK"
+else echo "centos7 fail" && cat packaging/$dist.log
 fi

 # Fedora 22
 echo "Testing fedora22..."
 if docker run -i -t --rm -v $PWD:/v -e "NODE_ENV=development" nodesource/fedora22:$version_node >packaging/$dist.log 2>&1 sh -c "cd /v; $test";
-then echo "$dist OK"
-else echo "$dist fail" && cat packaging/$dist.log
+then echo "fedora22 OK"
+else echo "fedora22 fail" && cat packaging/$dist.log
 fi

 # openSUSE 13.2
@@ -43,7 +43,7 @@ fi

 # Archlinux 2015.06.01
 echo "Testing archlinux..."
-if docker run -i -t --rm -v $PWD:/v base/archlinux:2015.06.01 >packaging/archlinux.log 2>&1 sh -c "cd /v; ./packaging/test/archlinux.sh; $test";
+if docker run -i -t --rm -v $PWD:/v pritunl/archlinux:latest >packaging/archlinux.log 2>&1 sh -c "cd /v; ./packaging/test/archlinux.sh; $test";
 then echo "archlinux OK"
 else echo "archlinux fail" && cat packaging/archlinux.log
 fi
--- a/packaging/test/alpine.sh
+++ b/packaging/test/alpine.sh
@@ -3,5 +3,5 @@
 # Install build dependencies
 apk add --update make gcc g++ python nodejs

-# Install libvips with build headers and dependencies
-apk add libvips-dev --update --repository https://s3.amazonaws.com/wjordan-apk --allow-untrusted
+# Install libvips from aports/testing
+apk add --update --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing vips-dev
--- a/packaging/win/Dockerfile
+++ b/packaging/win/Dockerfile
@@ -1,20 +0,0 @@
-FROM debian:wheezy
-MAINTAINER Lovell Fuller <npm@lovell.info>
-
-RUN apt-get update && apt-get install -y curl zip
-
-ENV VERSION_VIPS=8.3.1
-
-# Fetch and unzip
-RUN mkdir /vips
-WORKDIR /vips
-RUN curl -L -O https://github.com/lovell/build-win64/releases/download/v${VERSION_VIPS}/vips-dev-w64-web-${VERSION_VIPS}.zip
-RUN unzip vips-dev-w64-web-${VERSION_VIPS}.zip
-
-# Clean and zip
-WORKDIR /vips/vips-dev-8.3
-RUN rm bin/libvipsCC-42.dll bin/libvips-cpp-42.dll bin/libgsf-win32-1-114.dll
-RUN cp bin/*.dll lib/
-RUN cp -r lib64/* lib/
-
-RUN GZIP=-9 tar czf /libvips-${VERSION_VIPS}-win.tar.gz include lib/glib-2.0 lib/libvips.lib lib/libglib-2.0.lib lib/libgobject-2.0.lib lib/*.dll
--- a/packaging/win32-x64/Dockerfile
+++ b/packaging/win32-x64/Dockerfile
@@ -0,0 +1,8 @@
+FROM debian:jessie
+MAINTAINER Lovell Fuller <npm@lovell.info>
+
+# Create Debian-based container suitable for post-processing Windows x64 binaries
+
+RUN apt-get update && apt-get install -y curl zip advancecomp
+
+ENV PLATFORM=win32-x64
--- a/preinstall.sh
+++ b/preinstall.sh
@@ -2,6 +2,8 @@

 # Use of this script is deprecated

+echo
+echo "WARNING: This script will stop working at the end of 2016"
 echo
 echo "WARNING: This script is no longer required on most 64-bit Linux systems when using sharp v0.12.0+"
 echo
@@ -10,10 +12,11 @@ echo
 echo "If you really, really need this script, it will attempt"
 echo "to globally install libvips if not already available."
 echo
+sleep 5

-vips_version_minimum=8.3.1
+vips_version_minimum=8.3.3
 vips_version_latest_major_minor=8.3
-vips_version_latest_patch=1
+vips_version_latest_patch=3

 openslide_version_minimum=3.4.0
 openslide_version_latest_major_minor=3.4
--- a/src/common.cc
+++ b/src/common.cc
@@ -1,32 +1,53 @@
 #include <cstdlib>
 #include <string>
 #include <string.h>
+
+#include <node.h>
+#include <node_buffer.h>
 #include <vips/vips8>

+#include "nan.h"
 #include "common.h"

-// Verify platform and compiler compatibility
-
-#if (VIPS_MAJOR_VERSION < 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION < 2))
-#error libvips version 8.2.0+ required - see sharp.dimens.io/page/install
-#endif
-
-#if ((!defined(__clang__)) && defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)))
-#error GCC version 4.6+ is required for C++11 features - see sharp.dimens.io/page/install#prerequisites
-#endif
-
-#if (defined(__clang__) && defined(__has_feature))
-#if (!__has_feature(cxx_range_for))
-#error clang version 3.0+ is required for C++11 features - see sharp.dimens.io/page/install#prerequisites
-#endif
-#endif
-
-#define EXIF_IFD0_ORIENTATION "exif-ifd0-Orientation"
-
 using vips::VImage;

 namespace sharp {

+  // Convenience methods to access the attributes of a v8::Object
+  bool HasAttr(v8::Handle<v8::Object> obj, std::string attr) {
+    return Nan::Has(obj, Nan::New(attr).ToLocalChecked()).FromJust();
+  }
+  std::string AttrAsStr(v8::Handle<v8::Object> obj, std::string attr) {
+    return *Nan::Utf8String(Nan::Get(obj, Nan::New(attr).ToLocalChecked()).ToLocalChecked());
+  }
+
+  // Create an InputDescriptor instance from a v8::Object describing an input image
+  InputDescriptor* CreateInputDescriptor(
+    v8::Handle<v8::Object> input, std::vector<v8::Local<v8::Object>> buffersToPersist
+  ) {
+    Nan::HandleScope();
+    InputDescriptor *descriptor = new InputDescriptor;
+    if (HasAttr(input, "file")) {
+      descriptor->file = AttrAsStr(input, "file");
+    } else {
+      v8::Local<v8::Object> buffer = AttrAs<v8::Object>(input, "buffer");
+      descriptor->bufferLength = node::Buffer::Length(buffer);
+      descriptor->buffer = node::Buffer::Data(buffer);
+      buffersToPersist.push_back(buffer);
+    }
+    // Density for vector-based input
+    if (HasAttr(input, "density")) {
+      descriptor->density = AttrTo<uint32_t>(input, "density");
+    }
+    // Raw pixel input
+    if (HasAttr(input, "rawChannels")) {
+      descriptor->rawChannels = AttrTo<uint32_t>(input, "rawChannels");
+      descriptor->rawWidth = AttrTo<uint32_t>(input, "rawWidth");
+      descriptor->rawHeight = AttrTo<uint32_t>(input, "rawHeight");
+    }
+    return descriptor;
+  }
+
  // How many tasks are in the queue?
  volatile int counterQueue = 0;

@@ -55,6 +76,9 @@ namespace sharp {
  bool IsDzZip(std::string const &str) {
    return EndsWith(str, ".zip") || EndsWith(str, ".ZIP") || EndsWith(str, ".szi") || EndsWith(str, ".SZI");
  }
+  bool IsV(std::string const &str) {
+    return EndsWith(str, ".v") || EndsWith(str, ".V") || EndsWith(str, ".vips") || EndsWith(str, ".VIPS");
+  }

  /*
    Provide a string identifier for the given image type.
@@ -73,6 +97,7 @@ namespace sharp {
      case ImageType::OPENSLIDE: id = "openslide"; break;
      case ImageType::PPM: id = "ppm"; break;
      case ImageType::FITS: id = "fits"; break;
+      case ImageType::VIPS: id = "v"; break;
      case ImageType::RAW: id = "raw"; break;
      case ImageType::UNKNOWN: id = "unknown"; break;
    }
@@ -136,6 +161,8 @@ namespace sharp {
        imageType = ImageType::PPM;
      } else if (EndsWith(loader, "Fits")) {
        imageType = ImageType::FITS;
+      } else if (EndsWith(loader, "Vips")) {
+        imageType = ImageType::VIPS;
      } else if (EndsWith(loader, "Magick") || EndsWith(loader, "MagickFile")) {
        imageType = ImageType::MAGICK;
      }
@@ -143,6 +170,73 @@ namespace sharp {
    return imageType;
  }

+  /*
+    Open an image from the given InputDescriptor (filesystem, compressed buffer, raw pixel data)
+  */
+  std::tuple<VImage, ImageType> OpenInput(InputDescriptor *descriptor, VipsAccess accessMethod) {
+    VImage image;
+    ImageType imageType;
+    if (descriptor->buffer != nullptr) {
+      // From buffer
+      if (descriptor->rawChannels > 0) {
+        // Raw, uncompressed pixel data
+        image = VImage::new_from_memory(descriptor->buffer, descriptor->bufferLength,
+          descriptor->rawWidth, descriptor->rawHeight, descriptor->rawChannels, VIPS_FORMAT_UCHAR);
+        if (descriptor->rawChannels < 3) {
+          image.get_image()->Type = VIPS_INTERPRETATION_B_W;
+        } else {
+          image.get_image()->Type = VIPS_INTERPRETATION_sRGB;
+        }
+        imageType = ImageType::RAW;
+      } else {
+        // Compressed data
+        imageType = DetermineImageType(descriptor->buffer, descriptor->bufferLength);
+        if (imageType != ImageType::UNKNOWN) {
+          try {
+            vips::VOption *option = VImage::option()->set("access", accessMethod);
+            if (imageType == ImageType::SVG || imageType == ImageType::PDF) {
+              option->set("dpi", static_cast<double>(descriptor->density));
+            }
+            if (imageType == ImageType::MAGICK) {
+              option->set("density", std::to_string(descriptor->density).data());
+            }
+            image = VImage::new_from_buffer(descriptor->buffer, descriptor->bufferLength, nullptr, option);
+            if (imageType == ImageType::SVG || imageType == ImageType::PDF || imageType == ImageType::MAGICK) {
+              SetDensity(image, descriptor->density);
+            }
+          } catch (...) {
+            throw vips::VError("Input buffer has corrupt header");
+          }
+        } else {
+          throw vips::VError("Input buffer contains unsupported image format");
+        }
+      }
+    } else {
+      // From filesystem
+      imageType = DetermineImageType(descriptor->file.data());
+      if (imageType != ImageType::UNKNOWN) {
+        try {
+          vips::VOption *option = VImage::option()->set("access", accessMethod);
+          if (imageType == ImageType::SVG || imageType == ImageType::PDF) {
+            option->set("dpi", static_cast<double>(descriptor->density));
+          }
+          if (imageType == ImageType::MAGICK) {
+            option->set("density", std::to_string(descriptor->density).data());
+          }
+          image = VImage::new_from_file(descriptor->file.data(), option);
+          if (imageType == ImageType::SVG || imageType == ImageType::PDF || imageType == ImageType::MAGICK) {
+            SetDensity(image, descriptor->density);
+          }
+        } catch (...) {
+          throw vips::VError("Input file has corrupt header");
+        }
+      } else {
+        throw vips::VError("Input file is missing or of an unsupported image format");
+      }
+    }
+    return std::make_tuple(image, imageType);
+  }
+
  /*
    Does this image have an embedded profile?
  */
@@ -277,4 +371,72 @@ namespace sharp {
    return std::make_tuple(left, top);
  }

+  /*
+    Calculate the (left, top) coordinates of the output image
+    within the input image, applying the given x and y offsets.
+  */
+  std::tuple<int, int> CalculateCrop(int const inWidth, int const inHeight,
+    int const outWidth, int const outHeight, int const x, int const y) {
+
+    // default values
+    int left = 0;
+    int top = 0;
+
+    // assign only if valid
+    if(x >= 0 && x < (inWidth - outWidth)) {
+      left = x;
+    } else if(x >= (inWidth - outWidth)) {
+      left = inWidth - outWidth;
+    }
+
+    if(y >= 0 && y < (inHeight - outHeight)) {
+      top = y;
+    } else if(y >= (inHeight - outHeight)) {
+      top = inHeight - outHeight;
+    }
+
+    // the resulting left and top could have been outside the image after calculation from bottom/right edges
+    if(left < 0) {
+      left = 0;
+    }
+    if(top < 0) {
+      top = 0;
+    }
+
+    return std::make_tuple(left, top);
+  }
+
+  /*
+    Are pixel values in this image 16-bit integer?
+  */
+  bool Is16Bit(VipsInterpretation const interpretation) {
+    return interpretation == VIPS_INTERPRETATION_RGB16 || interpretation == VIPS_INTERPRETATION_GREY16;
+  }
+
+  /*
+    Return the image alpha maximum. Useful for combining alpha bands. scRGB
+    images are 0 - 1 for image data, but the alpha is 0 - 255.
+  */
+  double MaximumImageAlpha(VipsInterpretation const interpretation) {
+    return Is16Bit(interpretation) ? 65535.0 : 255.0;
+  }
+
+  /*
+    Get boolean operation type from string
+  */
+  VipsOperationBoolean GetBooleanOperation(std::string const opStr) {
+    return static_cast<VipsOperationBoolean>(
+      vips_enum_from_nick(nullptr, VIPS_TYPE_OPERATION_BOOLEAN, opStr.data())
+    );
+  }
+
+  /*
+    Get interpretation type from string
+  */
+  VipsInterpretation GetInterpretation(std::string const typeStr) {
+    return static_cast<VipsInterpretation>(
+      vips_enum_from_nick(nullptr, VIPS_TYPE_INTERPRETATION, typeStr.data())
+    );
+  }
+
 }  // namespace sharp
--- a/src/common.h
+++ b/src/common.h
@@ -4,12 +4,70 @@
 #include <string>
 #include <tuple>

+#include <node.h>
 #include <vips/vips8>

+#include "nan.h"
+
+// Verify platform and compiler compatibility
+
+#if (VIPS_MAJOR_VERSION < 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION < 3))
+#error libvips version 8.3.x required - see sharp.dimens.io/page/install
+#endif
+
+#if ((!defined(__clang__)) && defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)))
+#error GCC version 4.6+ is required for C++11 features - see sharp.dimens.io/page/install#prerequisites
+#endif
+
+#if (defined(__clang__) && defined(__has_feature))
+#if (!__has_feature(cxx_range_for))
+#error clang version 3.0+ is required for C++11 features - see sharp.dimens.io/page/install#prerequisites
+#endif
+#endif
+
+#define EXIF_IFD0_ORIENTATION "exif-ifd0-Orientation"
+
 using vips::VImage;

 namespace sharp {

+  struct InputDescriptor {
+    std::string name;
+    std::string file;
+    char *buffer;
+    size_t bufferLength;
+    int density;
+    int rawChannels;
+    int rawWidth;
+    int rawHeight;
+
+    InputDescriptor():
+      buffer(nullptr),
+      bufferLength(0),
+      density(72),
+      rawChannels(0),
+      rawWidth(0),
+      rawHeight(0) {}
+  };
+
+  // Convenience methods to access the attributes of a v8::Object
+  bool HasAttr(v8::Handle<v8::Object> obj, std::string attr);
+  std::string AttrAsStr(v8::Handle<v8::Object> obj, std::string attr);
+  template<typename T> v8::Local<T> AttrAs(v8::Handle<v8::Object> obj, std::string attr) {
+    return Nan::Get(obj, Nan::New(attr).ToLocalChecked()).ToLocalChecked().As<T>();
+  }
+  template<typename T> T AttrTo(v8::Handle<v8::Object> obj, std::string attr) {
+    return Nan::To<T>(Nan::Get(obj, Nan::New(attr).ToLocalChecked()).ToLocalChecked()).FromJust();
+  }
+  template<typename T> T AttrTo(v8::Handle<v8::Object> obj, int attr) {
+    return Nan::To<T>(Nan::Get(obj, attr).ToLocalChecked()).FromJust();
+  }
+
+  // Create an InputDescriptor instance from a v8::Object describing an input image
+  InputDescriptor* CreateInputDescriptor(
+    v8::Handle<v8::Object> input, std::vector<v8::Local<v8::Object>> buffersToPersist
+  );
+
  enum class ImageType {
    JPEG,
    PNG,
@@ -22,6 +80,7 @@ namespace sharp {
    OPENSLIDE,
    PPM,
    FITS,
+    VIPS,
    RAW,
    UNKNOWN
  };
@@ -39,6 +98,7 @@ namespace sharp {
  bool IsTiff(std::string const &str);
  bool IsDz(std::string const &str);
  bool IsDzZip(std::string const &str);
+  bool IsV(std::string const &str);

  /*
    Provide a string identifier for the given image type.
@@ -55,6 +115,11 @@ namespace sharp {
  */
  ImageType DetermineImageType(char const *file);

+  /*
+    Open an image from the given InputDescriptor (filesystem, compressed buffer, raw pixel data)
+  */
+  std::tuple<VImage, ImageType> OpenInput(InputDescriptor *descriptor, VipsAccess accessMethod);
+
  /*
    Does this image have an embedded profile?
  */
@@ -108,6 +173,34 @@ namespace sharp {
  std::tuple<int, int> CalculateCrop(int const inWidth, int const inHeight,
    int const outWidth, int const outHeight, int const gravity);

+  /*
+    Calculate the (left, top) coordinates of the output image
+    within the input image, applying the given x and y offsets of the output image.
+  */
+  std::tuple<int, int> CalculateCrop(int const inWidth, int const inHeight,
+    int const outWidth, int const outHeight, int const x, int const y);
+
+  /*
+    Are pixel values in this image 16-bit integer?
+  */
+  bool Is16Bit(VipsInterpretation const interpretation);
+
+  /*
+    Return the image alpha maximum. Useful for combining alpha bands. scRGB
+    images are 0 - 1 for image data, but the alpha is 0 - 255.
+  */
+  double MaximumImageAlpha(VipsInterpretation const interpretation);
+
+  /*
+    Get boolean operation type from string
+  */
+  VipsOperationBoolean GetBooleanOperation(std::string const opStr);
+
+  /*
+    Get interpretation type from string
+  */
+  VipsInterpretation GetInterpretation(std::string const typeStr);
+
 }  // namespace sharp

 #endif  // SRC_COMMON_H_
--- a/src/metadata.cc
+++ b/src/metadata.cc
@@ -1,135 +1,54 @@
+#include <numeric>
+
 #include <node.h>
 #include <vips/vips8>

 #include "nan.h"
-
 #include "common.h"
 #include "metadata.h"

-using v8::Handle;
-using v8::Local;
-using v8::Value;
-using v8::Object;
-using v8::Number;
-using v8::String;
-using v8::Boolean;
-using v8::Function;
-using v8::Exception;
-
-using Nan::AsyncQueueWorker;
-using Nan::AsyncWorker;
-using Nan::Callback;
-using Nan::HandleScope;
-using Nan::Utf8String;
-using Nan::Has;
-using Nan::Get;
-using Nan::Set;
-using Nan::New;
-using Nan::NewBuffer;
-using Nan::Null;
-using Nan::Error;
-
-using vips::VImage;
-using vips::VError;
-
-using sharp::ImageType;
-using sharp::ImageTypeId;
-using sharp::DetermineImageType;
-using sharp::HasProfile;
-using sharp::HasAlpha;
-using sharp::ExifOrientation;
-using sharp::HasDensity;
-using sharp::GetDensity;
-using sharp::FreeCallback;
-using sharp::counterQueue;
-
-struct MetadataBaton {
-  // Input
-  std::string fileIn;
-  char *bufferIn;
-  size_t bufferInLength;
-  // Output
-  std::string format;
-  int width;
-  int height;
-  std::string space;
-  int channels;
-  int density;
-  bool hasProfile;
-  bool hasAlpha;
-  int orientation;
-  char *exif;
-  size_t exifLength;
-  char *icc;
-  size_t iccLength;
-  std::string err;
-
-  MetadataBaton():
-    bufferInLength(0),
-    density(0),
-    orientation(0),
-    exifLength(0),
-    iccLength(0) {}
-};
-
-class MetadataWorker : public AsyncWorker {
+class MetadataWorker : public Nan::AsyncWorker {
 public:
-  MetadataWorker(Callback *callback, MetadataBaton *baton, const Local<Object> &bufferIn) :
-    AsyncWorker(callback), baton(baton) {
-      if (baton->bufferInLength > 0) {
-        SaveToPersistent("bufferIn", bufferIn);
+  MetadataWorker(
+    Nan::Callback *callback, MetadataBaton *baton,
+    std::vector<v8::Local<v8::Object>> const buffersToPersist
+  ) : Nan::AsyncWorker(callback), baton(baton), buffersToPersist(buffersToPersist) {
+    // Protect Buffer objects from GC, keyed on index
+    std::accumulate(buffersToPersist.begin(), buffersToPersist.end(), 0,
+      [this](uint32_t index, v8::Local<v8::Object> const buffer) -> uint32_t {
+        SaveToPersistent(index, buffer);
+        return index + 1;
      }
-    }
+    );
+  }
  ~MetadataWorker() {}

  void Execute() {
    // Decrement queued task counter
-    g_atomic_int_dec_and_test(&counterQueue);
+    g_atomic_int_dec_and_test(&sharp::counterQueue);

-    ImageType imageType = ImageType::UNKNOWN;
-    VImage image;
-    if (baton->bufferInLength > 0) {
-      // From buffer
-      imageType = DetermineImageType(baton->bufferIn, baton->bufferInLength);
-      if (imageType != ImageType::UNKNOWN) {
-        try {
-          image = VImage::new_from_buffer(baton->bufferIn, baton->bufferInLength, nullptr);
-        } catch (...) {
-          (baton->err).append("Input buffer has corrupt header");
-          imageType = ImageType::UNKNOWN;
-        }
-      } else {
-        (baton->err).append("Input buffer contains unsupported image format");
-      }
-    } else {
-      // From file
-      imageType = DetermineImageType(baton->fileIn.data());
-      if (imageType != ImageType::UNKNOWN) {
-        try {
-          image = VImage::new_from_file(baton->fileIn.data());
-        } catch (...) {
-          (baton->err).append("Input file has corrupt header");
-          imageType = ImageType::UNKNOWN;
-        }
-      } else {
-        (baton->err).append("Input file is missing or of an unsupported image format");
-      }
+    vips::VImage image;
+    sharp::ImageType imageType = sharp::ImageType::UNKNOWN;
+    try {
+      std::tie(image, imageType) = OpenInput(baton->input, VIPS_ACCESS_SEQUENTIAL);
+    } catch (vips::VError const &err) {
+      (baton->err).append(err.what());
    }
-    if (imageType != ImageType::UNKNOWN) {
+    if (imageType != sharp::ImageType::UNKNOWN) {
      // Image type
-      baton->format = ImageTypeId(imageType);
+      baton->format = sharp::ImageTypeId(imageType);
      // VipsImage attributes
      baton->width = image.width();
      baton->height = image.height();
      baton->space = vips_enum_nick(VIPS_TYPE_INTERPRETATION, image.interpretation());
      baton->channels = image.bands();
-      if (HasDensity(image)) {
-        baton->density = GetDensity(image);
+      if (sharp::HasDensity(image)) {
+        baton->density = sharp::GetDensity(image);
      }
-      baton->hasProfile = HasProfile(image);
+      baton->hasProfile = sharp::HasProfile(image);
      // Derived attributes
-      baton->hasAlpha = HasAlpha(image);
-      baton->orientation = ExifOrientation(image);
+      baton->hasAlpha = sharp::HasAlpha(image);
+      baton->orientation = sharp::ExifOrientation(image);
      // EXIF
      if (image.get_typeof(VIPS_META_EXIF_NAME) == VIPS_TYPE_BLOB) {
        size_t exifLength;
@@ -147,53 +66,59 @@ class MetadataWorker : public AsyncWorker {
        baton->iccLength = iccLength;
      }
    }
+
    // Clean up
    vips_error_clear();
    vips_thread_shutdown();
  }

  void HandleOKCallback () {
-    HandleScope();
+    using Nan::New;
+    using Nan::Set;
+    Nan::HandleScope();

-    Local<Value> argv[2] = { Null(), Null() };
+    v8::Local<v8::Value> argv[2] = { Nan::Null(), Nan::Null() };
    if (!baton->err.empty()) {
-      // Error
-      argv[0] = Error(baton->err.data());
+      argv[0] = Nan::Error(baton->err.data());
    } else {
      // Metadata Object
-      Local<Object> info = New<Object>();
-      Set(info, New("format").ToLocalChecked(), New<String>(baton->format).ToLocalChecked());
-      Set(info, New("width").ToLocalChecked(), New<Number>(baton->width));
-      Set(info, New("height").ToLocalChecked(), New<Number>(baton->height));
-      Set(info, New("space").ToLocalChecked(), New<String>(baton->space).ToLocalChecked());
-      Set(info, New("channels").ToLocalChecked(), New<Number>(baton->channels));
+      v8::Local<v8::Object> info = New<v8::Object>();
+      Set(info, New("format").ToLocalChecked(), New<v8::String>(baton->format).ToLocalChecked());
+      Set(info, New("width").ToLocalChecked(), New<v8::Uint32>(baton->width));
+      Set(info, New("height").ToLocalChecked(), New<v8::Uint32>(baton->height));
+      Set(info, New("space").ToLocalChecked(), New<v8::String>(baton->space).ToLocalChecked());
+      Set(info, New("channels").ToLocalChecked(), New<v8::Uint32>(baton->channels));
      if (baton->density > 0) {
-        Set(info, New("density").ToLocalChecked(), New<Number>(baton->density));
+        Set(info, New("density").ToLocalChecked(), New<v8::Uint32>(baton->density));
      }
-      Set(info, New("hasProfile").ToLocalChecked(), New<Boolean>(baton->hasProfile));
-      Set(info, New("hasAlpha").ToLocalChecked(), New<Boolean>(baton->hasAlpha));
+      Set(info, New("hasProfile").ToLocalChecked(), New<v8::Boolean>(baton->hasProfile));
+      Set(info, New("hasAlpha").ToLocalChecked(), New<v8::Boolean>(baton->hasAlpha));
      if (baton->orientation > 0) {
-        Set(info, New("orientation").ToLocalChecked(), New<Number>(baton->orientation));
+        Set(info, New("orientation").ToLocalChecked(), New<v8::Uint32>(baton->orientation));
      }
      if (baton->exifLength > 0) {
        Set(info,
          New("exif").ToLocalChecked(),
-          NewBuffer(baton->exif, baton->exifLength, FreeCallback, nullptr).ToLocalChecked()
+          Nan::NewBuffer(baton->exif, baton->exifLength, sharp::FreeCallback, nullptr).ToLocalChecked()
        );
      }
      if (baton->iccLength > 0) {
        Set(info,
          New("icc").ToLocalChecked(),
-          NewBuffer(baton->icc, baton->iccLength, FreeCallback, nullptr).ToLocalChecked()
+          Nan::NewBuffer(baton->icc, baton->iccLength, sharp::FreeCallback, nullptr).ToLocalChecked()
        );
      }
      argv[1] = info;
    }

-    // Dispose of Persistent wrapper around input Buffer so it can be garbage collected
-    if (baton->bufferInLength > 0) {
-      GetFromPersistent("bufferIn");
-    }
+    // Dispose of Persistent wrapper around input Buffers so they can be garbage collected
+    std::accumulate(buffersToPersist.begin(), buffersToPersist.end(), 0,
+      [this](uint32_t index, v8::Local<v8::Object> const buffer) -> uint32_t {
+        GetFromPersistent(index);
+        return index + 1;
+      }
+    );
+    delete baton->input;
    delete baton;

    // Return to JavaScript
@@ -202,32 +127,27 @@ class MetadataWorker : public AsyncWorker {

 private:
  MetadataBaton* baton;
+  std::vector<v8::Local<v8::Object>> buffersToPersist;
 };

 /*
  metadata(options, callback)
 */
 NAN_METHOD(metadata) {
-  HandleScope();
+  // Input Buffers must not undergo GC compaction during processing
+  std::vector<v8::Local<v8::Object>> buffersToPersist;

  // V8 objects are converted to non-V8 types held in the baton struct
  MetadataBaton *baton = new MetadataBaton;
-  Local<Object> options = info[0].As<Object>();
+  v8::Local<v8::Object> options = info[0].As<v8::Object>();

-  // Input filename
-  baton->fileIn = *Utf8String(Get(options, New("fileIn").ToLocalChecked()).ToLocalChecked());
-  // Input Buffer object
-  Local<Object> bufferIn;
-  if (node::Buffer::HasInstance(Get(options, New("bufferIn").ToLocalChecked()).ToLocalChecked())) {
-    bufferIn = Get(options, New("bufferIn").ToLocalChecked()).ToLocalChecked().As<Object>();
-    baton->bufferInLength = node::Buffer::Length(bufferIn);
-    baton->bufferIn = node::Buffer::Data(bufferIn);
-  }
+  // Input
+  baton->input = sharp::CreateInputDescriptor(sharp::AttrAs<v8::Object>(options, "input"), buffersToPersist);

  // Join queue for worker thread
-  Callback *callback = new Callback(info[1].As<Function>());
-  AsyncQueueWorker(new MetadataWorker(callback, baton, bufferIn));
+  Nan::Callback *callback = new Nan::Callback(info[1].As<v8::Function>());
+  Nan::AsyncQueueWorker(new MetadataWorker(callback, baton, buffersToPersist));

  // Increment queued task counter
-  g_atomic_int_inc(&counterQueue);
+  g_atomic_int_inc(&sharp::counterQueue);
 }
--- a/src/metadata.h
+++ b/src/metadata.h
@@ -2,6 +2,41 @@
 #define SRC_METADATA_H_

 #include "nan.h"
+#include "common.h"
+
+struct MetadataBaton {
+  // Input
+  sharp::InputDescriptor *input;
+  // Output
+  std::string format;
+  int width;
+  int height;
+  std::string space;
+  int channels;
+  int density;
+  bool hasProfile;
+  bool hasAlpha;
+  int orientation;
+  char *exif;
+  size_t exifLength;
+  char *icc;
+  size_t iccLength;
+  std::string err;
+
+  MetadataBaton():
+    input(nullptr),
+    width(0),
+    height(0),
+    channels(0),
+    density(0),
+    hasProfile(false),
+    hasAlpha(false),
+    orientation(0),
+    exif(nullptr),
+    exifLength(0),
+    icc(nullptr),
+    iccLength(0) {}
+};

 NAN_METHOD(metadata);

--- a/src/operations.cc
+++ b/src/operations.cc
@@ -1,4 +1,6 @@
 #include <algorithm>
+#include <functional>
+#include <memory>
 #include <tuple>
 #include <vips/vips8>

@@ -15,6 +17,49 @@ namespace sharp {
    Assumes alpha channels are already premultiplied and will be unpremultiplied after.
   */
  VImage Composite(VImage src, VImage dst, const int gravity) {
+    if(IsInputValidForComposition(src, dst)) {
+      // Enlarge overlay src, if required
+      if (src.width() < dst.width() || src.height() < dst.height()) {
+        // Calculate the (left, top) coordinates of the output image within the input image, applying the given gravity.
+        int left;
+        int top;
+        std::tie(left, top) = CalculateCrop(dst.width(), dst.height(), src.width(), src.height(), gravity);
+        // Embed onto transparent background
+        std::vector<double> background { 0.0, 0.0, 0.0, 0.0 };
+        src = src.embed(left, top, dst.width(), dst.height(), VImage::option()
+          ->set("extend", VIPS_EXTEND_BACKGROUND)
+          ->set("background", background)
+        );
+      }
+      return CompositeImage(src, dst);
+    }
+    // If the input was not valid for composition the return the input image itself
+    return dst;
+  }
+
+
+  VImage Composite(VImage src, VImage dst, const int x, const int y) {
+    if(IsInputValidForComposition(src, dst)) {
+      // Enlarge overlay src, if required
+      if (src.width() < dst.width() || src.height() < dst.height()) {
+        // Calculate the (left, top) coordinates of the output image within the input image, applying the given gravity.
+        int left;
+        int top;
+        std::tie(left, top) = CalculateCrop(dst.width(), dst.height(), src.width(), src.height(), x, y);
+        // Embed onto transparent background
+        std::vector<double> background { 0.0, 0.0, 0.0, 0.0 };
+        src = src.embed(left, top, dst.width(), dst.height(), VImage::option()
+          ->set("extend", VIPS_EXTEND_BACKGROUND)
+          ->set("background", background)
+        );
+      }
+      return CompositeImage(src, dst);
+    }
+    // If the input was not valid for composition the return the input image itself
+    return dst;
+  }
+
+  bool IsInputValidForComposition(VImage src, VImage dst) {
    using sharp::CalculateCrop;
    using sharp::HasAlpha;

@@ -28,20 +73,10 @@ namespace sharp {
      throw VError("Overlay image must have same dimensions or smaller");
    }

-    // Enlarge overlay src, if required
-    if (src.width() < dst.width() || src.height() < dst.height()) {
-      // Calculate the (left, top) coordinates of the output image within the input image, applying the given gravity.
-      int left;
-      int top;
-      std::tie(left, top) = CalculateCrop(dst.width(), dst.height(), src.width(), src.height(), gravity);
-      // Embed onto transparent background
-      std::vector<double> background { 0.0, 0.0, 0.0, 0.0 };
-      src = src.embed(left, top, dst.width(), dst.height(), VImage::option()
-        ->set("extend", VIPS_EXTEND_BACKGROUND)
-        ->set("background", background)
-      );
-    }
+    return true;
+  }

+  VImage CompositeImage(VImage src, VImage dst) {
    // Split src into non-alpha and alpha channels
    VImage srcWithoutAlpha = src.extract_band(0, VImage::option()->set("n", src.bands() - 1));
    VImage srcAlpha = src[src.bands() - 1] * (1.0 / 255.0);
@@ -81,6 +116,65 @@ namespace sharp {
    return outRGBPremultiplied.bandjoin(outAlphaNormalized * 255.0);
  }

+  /*
+    Cutout src over dst with given gravity.
+   */
+  VImage Cutout(VImage mask, VImage dst, const int gravity) {
+    using sharp::CalculateCrop;
+    using sharp::HasAlpha;
+    using sharp::MaximumImageAlpha;
+
+    bool maskHasAlpha = HasAlpha(mask);
+
+    if (!maskHasAlpha && mask.bands() > 1) {
+      throw VError("Overlay image must have an alpha channel or one band");
+    }
+    if (!HasAlpha(dst)) {
+      throw VError("Image to be overlaid must have an alpha channel");
+    }
+    if (mask.width() > dst.width() || mask.height() > dst.height()) {
+      throw VError("Overlay image must have same dimensions or smaller");
+    }
+
+    // Enlarge overlay mask, if required
+    if (mask.width() < dst.width() || mask.height() < dst.height()) {
+      // Calculate the (left, top) coordinates of the output image within the input image, applying the given gravity.
+      int left;
+      int top;
+      std::tie(left, top) = CalculateCrop(dst.width(), dst.height(), mask.width(), mask.height(), gravity);
+      // Embed onto transparent background
+      std::vector<double> background { 0.0, 0.0, 0.0, 0.0 };
+      mask = mask.embed(left, top, dst.width(), dst.height(), VImage::option()
+              ->set("extend", VIPS_EXTEND_BACKGROUND)
+              ->set("background", background)
+      );
+    }
+
+    // we use the mask alpha if it has alpha
+    if(maskHasAlpha) {
+      mask = mask.extract_band(mask.bands() - 1, VImage::option()->set("n", 1));;
+    }
+
+    // Split dst into an optional alpha
+    VImage dstAlpha = dst.extract_band(dst.bands() - 1, VImage::option()->set("n", 1));
+
+    // we use the dst non-alpha
+    dst = dst.extract_band(0, VImage::option()->set("n", dst.bands() - 1));
+
+    // the range of the mask and the image need to match .. one could be
+    // 16-bit, one 8-bit
+    double const dstMax = MaximumImageAlpha(dst.interpretation());
+    double const maskMax = MaximumImageAlpha(mask.interpretation());
+
+    // combine the new mask and the existing alpha ... there are
+    // many ways of doing this, mult is the simplest
+    mask = dstMax * ((mask / maskMax) * (dstAlpha / dstMax));
+
+    // append the mask to the image data ... the mask might be float now,
+    // we must cast the format down to match the image data
+    return dst.bandjoin(mask.cast(dst.format()));
+  }
+
  /*
   * Stretch luminance to cover full dynamic range.
   */
@@ -152,6 +246,26 @@ namespace sharp {
    }
  }

+  /*
+   * Convolution with a kernel.
+   */
+  VImage Convolve(VImage image, int const width, int const height,
+    double const scale, double const offset,
+    std::unique_ptr<double[]> const &kernel_v
+  ) {
+    VImage kernel = VImage::new_from_memory(
+      kernel_v.get(),
+      width * height * sizeof(double),
+      width,
+      height,
+      1,
+      VIPS_FORMAT_DOUBLE);
+    kernel.set("scale", scale);
+    kernel.set("offset", offset);
+
+    return image.conv(kernel);
+  }
+
  /*
   * Sharpen flat and jagged areas. Use sigma of -1.0 for fast sharpen.
   */
@@ -166,75 +280,114 @@ namespace sharp {
      return image.conv(sharpen);
    } else {
      // Slow, accurate sharpen in LAB colour space, with control over flat vs jagged areas
+      VipsInterpretation colourspaceBeforeSharpen = image.interpretation();
+      if (colourspaceBeforeSharpen == VIPS_INTERPRETATION_RGB) {
+        colourspaceBeforeSharpen = VIPS_INTERPRETATION_sRGB;
+      }
      return image.sharpen(
        VImage::option()->set("sigma", sigma)->set("m1", flat)->set("m2", jagged)
-      );
+      ).colourspace(colourspaceBeforeSharpen);
    }
  }

+  /*
+    Calculate the Shannon entropy
+  */
+  double EntropyStrategy::operator()(VImage image) {
+    return image.hist_find().hist_entropy();
+  }
+
+  /*
+    Calculate the intensity of edges, skin tone and saturation
+  */
+  double AttentionStrategy::operator()(VImage image) {
+    // Convert to LAB colourspace
+    VImage lab = image.colourspace(VIPS_INTERPRETATION_LAB);
+    VImage l = lab[0];
+    VImage a = lab[1];
+    VImage b = lab[2];
+    // Edge detect luminosity with the Sobel operator
+    VImage sobel = vips::VImage::new_matrixv(3, 3,
+      -1.0, 0.0, 1.0,
+      -2.0, 0.0, 2.0,
+      -1.0, 0.0, 1.0);
+    VImage edges = l.conv(sobel).abs() + l.conv(sobel.rot90()).abs();
+    // Skin tone chroma thresholds trained with http://humanae.tumblr.com/
+    VImage skin = (a >= 3) & (a <= 22) & (b >= 4) & (b <= 31);
+    // Chroma >~50% saturation
+    VImage lch = lab.colourspace(VIPS_INTERPRETATION_LCH);
+    VImage c = lch[1];
+    VImage saturation = c > 60;
+    // Find maximum in combined saliency mask
+    VImage mask = edges + skin + saturation;
+    return mask.max();
+  }
+
  /*
    Calculate crop area based on image entropy
  */
-  std::tuple<int, int> EntropyCrop(VImage image, int const outWidth, int const outHeight) {
+  std::tuple<int, int> Crop(
+    VImage image, int const outWidth, int const outHeight, std::function<double(VImage)> strategy
+  ) {
    int left = 0;
    int top = 0;
    int const inWidth = image.width();
    int const inHeight = image.height();
    if (inWidth > outWidth) {
-      // Reduce width by repeated removing slices from edge with lowest entropy
+      // Reduce width by repeated removing slices from edge with lowest score
      int width = inWidth;
-      double leftEntropy = 0.0;
-      double rightEntropy = 0.0;
+      double leftScore = 0.0;
+      double rightScore = 0.0;
      // Max width of each slice
      int const maxSliceWidth = static_cast<int>(ceil((inWidth - outWidth) / 8.0));
      while (width > outWidth) {
        // Width of current slice
        int const slice = std::min(width - outWidth, maxSliceWidth);
-        if (leftEntropy == 0.0) {
-          // Update entropy of left slice
-          leftEntropy = Entropy(image.extract_area(left, 0, slice, inHeight));
+        if (leftScore == 0.0) {
+          // Update score of left slice
+          leftScore = strategy(image.extract_area(left, 0, slice, inHeight));
        }
-        if (rightEntropy == 0.0) {
-          // Update entropy of right slice
-          rightEntropy = Entropy(image.extract_area(width - slice - 1, 0, slice, inHeight));
+        if (rightScore == 0.0) {
+          // Update score of right slice
+          rightScore = strategy(image.extract_area(width - slice - 1, 0, slice, inHeight));
        }
-        // Keep slice with highest entropy
-        if (leftEntropy >= rightEntropy) {
+        // Keep slice with highest score
+        if (leftScore >= rightScore) {
          // Discard right slice
-          rightEntropy = 0.0;
+          rightScore = 0.0;
        } else {
          // Discard left slice
-          leftEntropy = 0.0;
+          leftScore = 0.0;
          left = left + slice;
        }
        width = width - slice;
      }
    }
    if (inHeight > outHeight) {
-      // Reduce height by repeated removing slices from edge with lowest entropy
+      // Reduce height by repeated removing slices from edge with lowest score
      int height = inHeight;
-      double topEntropy = 0.0;
-      double bottomEntropy = 0.0;
+      double topScore = 0.0;
+      double bottomScore = 0.0;
      // Max height of each slice
      int const maxSliceHeight = static_cast<int>(ceil((inHeight - outHeight) / 8.0));
      while (height > outHeight) {
        // Height of current slice
        int const slice = std::min(height - outHeight, maxSliceHeight);
-        if (topEntropy == 0.0) {
-          // Update entropy of top slice
-          topEntropy = Entropy(image.extract_area(0, top, inWidth, slice));
+        if (topScore == 0.0) {
+          // Update score of top slice
+          topScore = strategy(image.extract_area(0, top, inWidth, slice));
        }
-        if (bottomEntropy == 0.0) {
-          // Update entropy of bottom slice
-          bottomEntropy = Entropy(image.extract_area(0, height - slice - 1, inWidth, slice));
+        if (bottomScore == 0.0) {
+          // Update score of bottom slice
+          bottomScore = strategy(image.extract_area(0, height - slice - 1, inWidth, slice));
        }
-        // Keep slice with highest entropy
-        if (topEntropy >= bottomEntropy) {
+        // Keep slice with highest score
+        if (topScore >= bottomScore) {
          // Discard bottom slice
-          bottomEntropy = 0.0;
+          bottomScore = 0.0;
        } else {
          // Discard top slice
-          topEntropy = 0.0;
+          topScore = 0.0;
          top = top + slice;
        }
        height = height - slice;
@@ -243,13 +396,6 @@ namespace sharp {
    return std::make_tuple(left, top);
  }

-  /*
-    Calculate the Shannon entropy for an image
-  */
-  double Entropy(VImage image) {
-    return image.hist_find().hist_entropy();
-  }
-
  /*
    Insert a tile cache to prevent over-computation of any previous operations in the pipeline
  */
@@ -268,4 +414,78 @@ namespace sharp {
    );
  }

+  VImage Threshold(VImage image, double const threshold, bool const thresholdGrayscale) {
+    if(!thresholdGrayscale) {
+      return image >= threshold;
+    }
+    return image.colourspace(VIPS_INTERPRETATION_B_W) >= threshold;
+  }
+
+  /*
+    Perform boolean/bitwise operation on image color channels - results in one channel image
+  */
+  VImage Bandbool(VImage image, VipsOperationBoolean const boolean) {
+    image = image.bandbool(boolean);
+    return image.copy(VImage::option()->set("interpretation", VIPS_INTERPRETATION_B_W));
+  }
+
+  /*
+    Perform bitwise boolean operation between images
+  */
+  VImage Boolean(VImage image, VImage imageR, VipsOperationBoolean const boolean) {
+    return image.boolean(imageR, boolean);
+  }
+
+  VImage Trim(VImage image, int const tolerance) {
+    using sharp::MaximumImageAlpha;
+    // An equivalent of ImageMagick's -trim in C++ ... automatically remove
+    // "boring" image edges.
+
+    // We use .project to sum the rows and columns of a 0/255 mask image, the first
+    // non-zero row or column is the object edge. We make the mask image with an
+    // amount-different-from-background image plus a threshold.
+
+    // find the value of the pixel at (0, 0) ... we will search for all pixels
+    // significantly different from this
+    std::vector<double> background = image(0, 0);
+
+    double const max = MaximumImageAlpha(image.interpretation());
+
+    // we need to smooth the image, subtract the background from every pixel, take
+    // the absolute value of the difference, then threshold
+    VImage mask = (image.median(3) - background).abs() > (max * tolerance / 100);
+
+    // sum mask rows and columns, then search for the first non-zero sum in each
+    // direction
+    VImage rows;
+    VImage columns = mask.project(&rows);
+
+    VImage profileLeftV;
+    VImage profileLeftH = columns.profile(&profileLeftV);
+
+    VImage profileRightV;
+    VImage profileRightH = columns.fliphor().profile(&profileRightV);
+
+    VImage profileTopV;
+    VImage profileTopH = rows.profile(&profileTopV);
+
+    VImage profileBottomV;
+    VImage profileBottomH = rows.flipver().profile(&profileBottomV);
+
+    int left = static_cast<int>(floor(profileLeftV.min()));
+    int right = columns.width() - static_cast<int>(floor(profileRightV.min()));
+    int top = static_cast<int>(floor(profileTopH.min()));
+    int bottom = rows.height() - static_cast<int>(floor(profileBottomH.min()));
+
+    int width = right - left;
+    int height = bottom - top;
+
+    if(width <= 0 || height <= 0) {
+      throw VError("Unexpected error while trimming. Try to lower the tolerance");
+    }
+
+    // and now crop the original image
+    return image.extract_area(left, top, width, height);
+  }
+
 }  // namespace sharp
--- a/src/operations.h
+++ b/src/operations.h
@@ -1,6 +1,9 @@
 #ifndef SRC_OPERATIONS_H_
 #define SRC_OPERATIONS_H_

+#include <algorithm>
+#include <functional>
+#include <memory>
 #include <tuple>
 #include <vips/vips8>

@@ -14,6 +17,27 @@ namespace sharp {
   */
  VImage Composite(VImage src, VImage dst, const int gravity);

+  /*
+    Alpha composite src over dst with given x and y offsets.
+    Assumes alpha channels are already premultiplied and will be unpremultiplied after.
+   */
+  VImage Composite(VImage src, VImage dst, const int x, const int y);
+
+  /*
+    Check if the src and dst Images for composition operation are valid
+  */
+  bool IsInputValidForComposition(VImage src, VImage dst);
+
+  /*
+    Given a valid src and dst, returns the composite of the two images
+  */
+  VImage CompositeImage(VImage src, VImage dst);
+
+  /*
+    Cutout src over dst with given gravity.
+  */
+  VImage Cutout(VImage src, VImage dst, const int gravity);
+
  /*
   * Stretch luminance to cover full dynamic range.
   */
@@ -29,26 +53,59 @@ namespace sharp {
   */
  VImage Blur(VImage image, double const sigma);

+  /*
+   * Convolution with a kernel.
+   */
+  VImage Convolve(VImage image, int const width, int const height,
+    double const scale, double const offset, std::unique_ptr<double[]> const &kernel_v);
+
  /*
   * Sharpen flat and jagged areas. Use sigma of -1.0 for fast sharpen.
   */
  VImage Sharpen(VImage image, double const sigma, double const flat, double const jagged);

  /*
-    Calculate crop area based on image entropy
+    Crop strategy functors
  */
-  std::tuple<int, int> EntropyCrop(VImage image, int const outWidth, int const outHeight);
+  struct EntropyStrategy {
+    double operator()(VImage image);
+  };
+  struct AttentionStrategy {
+    double operator()(VImage image);
+  };

  /*
-    Calculate the Shannon entropy for an image
+    Calculate crop area based on given strategy (Entropy, Attention)
  */
-  double Entropy(VImage image);
+  std::tuple<int, int> Crop(
+    VImage image, int const outWidth, int const outHeight, std::function<double(VImage)> strategy
+  );

  /*
    Insert a tile cache to prevent over-computation of any previous operations in the pipeline
  */
  VImage TileCache(VImage image, double const factor);

+  /*
+    Threshold an image
+  */
+  VImage Threshold(VImage image, double const threshold, bool const thresholdColor);
+
+  /*
+    Perform boolean/bitwise operation on image color channels - results in one channel image
+  */
+  VImage Bandbool(VImage image, VipsOperationBoolean const boolean);
+
+  /*
+    Perform bitwise boolean operation between images
+  */
+  VImage Boolean(VImage image, VImage imageR, VipsOperationBoolean const boolean);
+
+  /*
+    Trim an image
+  */
+  VImage Trim(VImage image, int const tolerance);
+
 }  // namespace sharp

 #endif  // SRC_OPERATIONS_H_
--- a/src/pipeline.cc
+++ b/src/pipeline.cc
--- a/src/pipeline.h
+++ b/src/pipeline.h
@@ -1,9 +1,12 @@
 #ifndef SRC_PIPELINE_H_
 #define SRC_PIPELINE_H_

+#include <memory>
+
 #include <vips/vips8>

 #include "nan.h"
+#include "common.h"

 NAN_METHOD(pipeline);

@@ -16,23 +19,20 @@ enum class Canvas {
 };

 struct PipelineBaton {
-  std::string fileIn;
-  char *bufferIn;
-  size_t bufferInLength;
+  sharp::InputDescriptor *input;
  std::string iccProfilePath;
  int limitInputPixels;
-  int density;
-  int rawWidth;
-  int rawHeight;
-  int rawChannels;
  std::string formatOut;
  std::string fileOut;
  void *bufferOut;
  size_t bufferOutLength;
-  std::string overlayFileIn;
-  char *overlayBufferIn;
-  size_t overlayBufferInLength;
+  sharp::InputDescriptor *overlay;
  int overlayGravity;
+  int overlayXOffset;
+  int overlayYOffset;
+  bool overlayTile;
+  bool overlayCutout;
+  std::vector<sharp::InputDescriptor *> joinChannelIn;
  int topOffsetPre;
  int leftOffsetPre;
  int widthPre;
@@ -46,6 +46,8 @@ struct PipelineBaton {
  int channels;
  Canvas canvas;
  int crop;
+  int cropCalcLeft;
+  int cropCalcTop;
  std::string kernel;
  std::string interpolator;
  double background[4];
@@ -56,6 +58,8 @@ struct PipelineBaton {
  double sharpenFlat;
  double sharpenJagged;
  int threshold;
+  bool thresholdGrayscale;
+  int trimTolerance;
  double gamma;
  bool greyscale;
  bool normalize;
@@ -80,28 +84,38 @@ struct PipelineBaton {
  std::string err;
  bool withMetadata;
  int withMetadataOrientation;
+  std::unique_ptr<double[]> convKernel;
+  int convKernelWidth;
+  int convKernelHeight;
+  double convKernelScale;
+  double convKernelOffset;
+  sharp::InputDescriptor *boolean;
+  VipsOperationBoolean booleanOp;
+  VipsOperationBoolean bandBoolOp;
+  int extractChannel;
+  VipsInterpretation colourspace;
  int tileSize;
  int tileOverlap;
  VipsForeignDzContainer tileContainer;
  VipsForeignDzLayout tileLayout;

  PipelineBaton():
-    bufferInLength(0),
+    input(nullptr),
    limitInputPixels(0),
-    density(72),
-    rawWidth(0),
-    rawHeight(0),
-    rawChannels(0),
-    formatOut(""),
-    fileOut(""),
    bufferOutLength(0),
-    overlayBufferInLength(0),
+    overlay(nullptr),
    overlayGravity(0),
+    overlayXOffset(-1),
+    overlayYOffset(-1),
+    overlayTile(false),
+    overlayCutout(false),
    topOffsetPre(-1),
    topOffsetPost(-1),
    channels(0),
    canvas(Canvas::CROP),
    crop(0),
+    cropCalcLeft(-1),
+    cropCalcTop(-1),
    flatten(false),
    negate(false),
    blurSigma(0.0),
@@ -109,6 +123,8 @@ struct PipelineBaton {
    sharpenFlat(1.0),
    sharpenJagged(2.0),
    threshold(0),
+    thresholdGrayscale(true),
+    trimTolerance(0),
    gamma(0.0),
    greyscale(false),
    normalize(false),
@@ -130,6 +146,15 @@ struct PipelineBaton {
    optimiseScans(false),
    withMetadata(false),
    withMetadataOrientation(-1),
+    convKernelWidth(0),
+    convKernelHeight(0),
+    convKernelScale(0.0),
+    convKernelOffset(0.0),
+    boolean(nullptr),
+    booleanOp(VIPS_OPERATION_BOOLEAN_LAST),
+    bandBoolOp(VIPS_OPERATION_BOOLEAN_LAST),
+    extractChannel(-1),
+    colourspace(VIPS_INTERPRETATION_LAST),
    tileSize(256),
    tileOverlap(0),
    tileContainer(VIPS_FOREIGN_DZ_CONTAINER_FS),
--- a/src/utilities.cc
+++ b/src/utilities.cc
@@ -139,7 +139,7 @@ NAN_METHOD(format) {
  // Which load/save operations are available for each compressed format?
  Local<Object> format = New<Object>();
  for (std::string f : {
-    "jpeg", "png", "webp", "tiff", "magick", "openslide", "dz", "ppm", "fits", "gif", "svg", "pdf"
+    "jpeg", "png", "webp", "tiff", "magick", "openslide", "dz", "ppm", "fits", "gif", "svg", "pdf", "v"
  }) {
    // Input
    Local<Boolean> hasInputFile =
--- a/test/bench/package.json
+++ b/test/bench/package.json
@@ -8,14 +8,14 @@
    "test": "VIPS_WARNING=0 node perf && node random && node parallel"
  },
  "devDependencies": {
-    "async": "^1.5.2",
-    "benchmark": "^2.1.0",
-    "gm": "^1.22.0",
+    "async": "^2.1.1",
+    "benchmark": "^2.1.1",
+    "gm": "^1.23.0",
    "imagemagick": "^0.1.3",
-    "imagemagick-native": "^1.9.2",
-    "jimp": "^0.2.24",
+    "imagemagick-native": "^1.9.3",
+    "jimp": "^0.2.27",
    "lwip": "^0.0.9",
-    "semver": "^5.1.0"
+    "semver": "^5.3.0"
  },
  "license": "Apache-2.0",
  "engines": {
--- a/test/bench/perf.js
+++ b/test/bench/perf.js
@@ -519,6 +519,36 @@ async.series({
            }
          });
      }
+    }).add('sharp-crop-entropy', {
+      defer: true,
+      fn: function(deferred) {
+        sharp(inputJpgBuffer)
+          .resize(width, height)
+          .crop(sharp.strategy.entropy)
+          .toBuffer(function(err, buffer) {
+            if (err) {
+              throw err;
+            } else {
+              assert.notStrictEqual(null, buffer);
+              deferred.resolve();
+            }
+          });
+      }
+    }).add('sharp-crop-attention', {
+      defer: true,
+      fn: function(deferred) {
+        sharp(inputJpgBuffer)
+          .resize(width, height)
+          .crop(sharp.strategy.attention)
+          .toBuffer(function(err, buffer) {
+            if (err) {
+              throw err;
+            } else {
+              assert.notStrictEqual(null, buffer);
+              deferred.resolve();
+            }
+          });
+      }
    }).on('cycle', function(event) {
      console.log('operations ' + String(event.target));
    }).on('complete', function() {
--- a/test/fixtures/bandbool.png
+++ b/test/fixtures/bandbool.png
--- a/test/fixtures/booleanTest.jpg
+++ b/test/fixtures/booleanTest.jpg
--- a/test/fixtures/expected/addAlphaChanelBeforeExtend.png
+++ b/test/fixtures/expected/addAlphaChanelBeforeExtend.png
--- a/test/fixtures/expected/alpha-layer-1-fill-trim-resize.png
+++ b/test/fixtures/expected/alpha-layer-1-fill-trim-resize.png
--- a/test/fixtures/expected/bandbool_and_result.png
+++ b/test/fixtures/expected/bandbool_and_result.png
--- a/test/fixtures/expected/bandbool_eor_result.png
+++ b/test/fixtures/expected/bandbool_eor_result.png
--- a/test/fixtures/expected/bandbool_or_result.png
+++ b/test/fixtures/expected/bandbool_or_result.png
--- a/test/fixtures/expected/boolean_and_result.jpg
+++ b/test/fixtures/expected/boolean_and_result.jpg
--- a/test/fixtures/expected/boolean_eor_result.jpg
+++ b/test/fixtures/expected/boolean_eor_result.jpg
--- a/test/fixtures/expected/boolean_or_result.jpg
+++ b/test/fixtures/expected/boolean_or_result.jpg
--- a/test/fixtures/expected/conv-1.png
+++ b/test/fixtures/expected/conv-1.png
--- a/test/fixtures/expected/conv-2.png
+++ b/test/fixtures/expected/conv-2.png
--- a/test/fixtures/expected/conv-sobel-horizontal.jpg
+++ b/test/fixtures/expected/conv-sobel-horizontal.jpg
--- a/test/fixtures/expected/crop-entropy.jpg
+++ b/test/fixtures/expected/crop-entropy.jpg
--- a/test/fixtures/expected/crop-strategy.jpg
+++ b/test/fixtures/expected/crop-strategy.jpg
--- a/test/fixtures/expected/crop-strategy.png
+++ b/test/fixtures/expected/crop-strategy.png
--- a/test/fixtures/expected/embed-16bit.png
+++ b/test/fixtures/expected/embed-16bit.png
--- a/test/fixtures/expected/extract-blue.jpg
+++ b/test/fixtures/expected/extract-blue.jpg
--- a/test/fixtures/expected/extract-green.jpg
+++ b/test/fixtures/expected/extract-green.jpg
--- a/test/fixtures/expected/extract-red.jpg
+++ b/test/fixtures/expected/extract-red.jpg
--- a/test/fixtures/expected/extract.jpg
+++ b/test/fixtures/expected/extract.jpg
--- a/test/fixtures/expected/gamma-0.0.jpg
+++ b/test/fixtures/expected/gamma-0.0.jpg
--- a/test/fixtures/expected/joinChannel-cmyk.jpg
+++ b/test/fixtures/expected/joinChannel-cmyk.jpg
--- a/test/fixtures/expected/joinChannel-rgb.jpg
+++ b/test/fixtures/expected/joinChannel-rgb.jpg
--- a/test/fixtures/expected/joinChannel-rgba.png
+++ b/test/fixtures/expected/joinChannel-rgba.png
--- a/test/fixtures/expected/output.greyscale-single.jpg
+++ b/test/fixtures/expected/output.greyscale-single.jpg
--- a/test/fixtures/expected/overlay-bottom-edges-meet.jpg
+++ b/test/fixtures/expected/overlay-bottom-edges-meet.jpg
--- a/test/fixtures/expected/overlay-cutout-gravity-center.jpg
+++ b/test/fixtures/expected/overlay-cutout-gravity-center.jpg
--- a/test/fixtures/expected/overlay-cutout-gravity-centre.jpg
+++ b/test/fixtures/expected/overlay-cutout-gravity-centre.jpg
--- a/test/fixtures/expected/overlay-cutout-gravity-east.jpg
+++ b/test/fixtures/expected/overlay-cutout-gravity-east.jpg
--- a/test/fixtures/expected/overlay-cutout-gravity-north.jpg
+++ b/test/fixtures/expected/overlay-cutout-gravity-north.jpg
--- a/test/fixtures/expected/overlay-cutout-gravity-northeast.jpg
+++ b/test/fixtures/expected/overlay-cutout-gravity-northeast.jpg
--- a/test/fixtures/expected/overlay-cutout-gravity-northwest.jpg
+++ b/test/fixtures/expected/overlay-cutout-gravity-northwest.jpg
--- a/test/fixtures/expected/overlay-cutout-gravity-south.jpg
+++ b/test/fixtures/expected/overlay-cutout-gravity-south.jpg
--- a/test/fixtures/expected/overlay-cutout-gravity-southeast.jpg
+++ b/test/fixtures/expected/overlay-cutout-gravity-southeast.jpg
--- a/test/fixtures/expected/overlay-cutout-gravity-southwest.jpg
+++ b/test/fixtures/expected/overlay-cutout-gravity-southwest.jpg
--- a/test/fixtures/expected/overlay-cutout-gravity-west.jpg
+++ b/test/fixtures/expected/overlay-cutout-gravity-west.jpg
--- a/test/fixtures/expected/overlay-cutout-rotated90-gravity-northwest.jpg
+++ b/test/fixtures/expected/overlay-cutout-rotated90-gravity-northwest.jpg
--- a/test/fixtures/expected/overlay-cutout-rotated90.jpg
+++ b/test/fixtures/expected/overlay-cutout-rotated90.jpg
--- a/test/fixtures/expected/overlay-offset-0.jpg
+++ b/test/fixtures/expected/overlay-offset-0.jpg
--- a/test/fixtures/expected/overlay-offset-with-gravity-tile.jpg
+++ b/test/fixtures/expected/overlay-offset-with-gravity-tile.jpg
--- a/test/fixtures/expected/overlay-offset-with-gravity.jpg
+++ b/test/fixtures/expected/overlay-offset-with-gravity.jpg
--- a/test/fixtures/expected/overlay-offset-with-tile.jpg
+++ b/test/fixtures/expected/overlay-offset-with-tile.jpg
--- a/test/fixtures/expected/overlay-tile-gravity-center.jpg
+++ b/test/fixtures/expected/overlay-tile-gravity-center.jpg
--- a/test/fixtures/expected/overlay-tile-gravity-centre.jpg
+++ b/test/fixtures/expected/overlay-tile-gravity-centre.jpg
--- a/test/fixtures/expected/overlay-tile-gravity-east.jpg
+++ b/test/fixtures/expected/overlay-tile-gravity-east.jpg
--- a/test/fixtures/expected/overlay-tile-gravity-north.jpg
+++ b/test/fixtures/expected/overlay-tile-gravity-north.jpg
--- a/test/fixtures/expected/overlay-tile-gravity-northeast.jpg
+++ b/test/fixtures/expected/overlay-tile-gravity-northeast.jpg
--- a/test/fixtures/expected/overlay-tile-gravity-northwest.jpg
+++ b/test/fixtures/expected/overlay-tile-gravity-northwest.jpg
--- a/test/fixtures/expected/overlay-tile-gravity-south.jpg
+++ b/test/fixtures/expected/overlay-tile-gravity-south.jpg
--- a/test/fixtures/expected/overlay-tile-gravity-southeast.jpg
+++ b/test/fixtures/expected/overlay-tile-gravity-southeast.jpg
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Lovell Fuller	1051fcd278	Release v0.16.2	2016-10-22 18:39:33 +01:00
Lovell Fuller	1a0030e086	Restrict readelf usage to Linux only #602	2016-10-14 16:07:17 +01:00
Lovell Fuller	114ce370ed	Provide a default lib location when detecting C++11 ABI Useful for pkgconfig without -L, e.g. Alpine Linux See also commit `07d66da`	2016-10-13 12:38:53 +01:00
Lovell Fuller	207dcbeaa4	Release v0.16.1	2016-10-13 10:53:38 +01:00
Lovell Fuller	d4a1722863	The long-awaited return of code examples to README	2016-10-12 19:41:49 +01:00
Lovell Fuller	18b9991fe7	Add experimental 'attention' crop strategy	2016-10-12 11:18:58 +01:00
Lovell Fuller	739178dd74	Include '.node' ext for Meteor's require() implementation #537	2016-10-05 10:50:13 +01:00
Taka Kojima	dcd1392a85	Allow platform, arch and arm_version to be overridden (#581 ) Aids cross-compilation	2016-10-01 12:54:14 +01:00
Lovell Fuller	07d66da57b	Auto-detect C++11 ABI version, remove --sharp-cxx11 flag	2016-09-28 21:40:30 +01:00
Lovell Fuller	28ce33feb3	Fix y-axis calc when overlaying at fixed point #566	2016-09-16 11:20:08 +01:00
Brandon Aaron	86039a3f2b	Bumping png16 to 1.6.25 (#570 )	2016-09-12 19:43:16 +01:00
Lovell Fuller	af9d09f8ae	Ensure conv kernel scale is clamped to min val of 1 #561	2016-09-03 20:06:49 +01:00
Lovell Fuller	7c06a48ec0	Release v0.16.0	2016-08-18 09:00:04 +01:00
Lovell Fuller	7ada9dbd0d	Changelog update, fix for small leak introduced in `5c5d74a`	2016-08-17 20:56:53 +01:00
Matt Hirsch	5c5d74a903	Add joinChannel and toColourspace/toColorspace operations (#513 )	2016-08-17 15:42:05 +01:00
Lovell Fuller	72354d55a8	Doc and changelog updates #519 #540	2016-08-13 17:24:06 +01:00
cmtt	fc2002fbd0	Add alpha channels, if missing, to overlayWith images (#540 )	2016-08-13 17:19:15 +01:00
Matt Hirsch	82ec2715f1	Prevent bandbool creating a single channel sRGB image (#519 )	2016-08-13 14:55:15 +01:00
Lovell Fuller	ef6e90fb3c	Correct dist name logging in packaging test script	2016-08-13 11:43:13 +01:00
Lovell Fuller	475f0bf120	Refactor packaging scripts, add ARMv7/v8 binaries	2016-08-12 13:40:44 +01:00
Lovell Fuller	e68a14c94c	Dependency version bumps	2016-08-01 20:23:45 +01:00
Lovell Fuller	da0dc28bc4	Remove unescaped module_root_dir as it can contain spaces	2016-08-01 13:44:46 +01:00
Lovell Fuller	e6bfa52b0b	Add raw pixel data support to boolean and withOverlay ops The previously-scattered image opening logic has been refactored to a single ImageDescriptor struct/Object available to both JS and C++ code This removed about 150 LOC but more importantly reduces the complexity of adding/exposing new operations that require an input image.	2016-07-26 23:07:25 +01:00
Lovell Fuller	36bfbdee0d	Add support for using pre-compiled binaries with OSX	2016-07-25 16:32:42 +01:00
Lovell Fuller	7a9a4127a0	Remove deprecated interpolateWith method Version bump dependencies	2016-07-25 16:11:53 +01:00
Lovell Fuller	4f1472d4ff	Upgrade to libvips v8.3.2	2016-07-25 15:30:14 +01:00
Lovell Fuller	032bb7e96b	Ensure ICC profiles are removed from PNG output #521	2016-07-21 16:49:27 +01:00
Lovell Fuller	9ddc817a09	Add WebP availability check to test added in `a5bd68e`	2016-07-21 15:55:34 +01:00
Lovell Fuller	a5bd68ef8c	Recalc after WebP shrink-on-load to avoid rounding errors #508	2016-07-21 15:18:14 +01:00
Lovell Fuller	a2ec3642bf	Alpine now provides vips in its testing repo Resize+sharpen+alpha seems to stack-smash, ignore for now	2016-07-20 20:05:43 +01:00
Lovell Fuller	9647fe1b9f	Reduce size of pre-built binaries by ~5%	2016-07-20 20:03:41 +01:00
Lovell Fuller	762cda75a9	Update libxml2 dependency CVE-2016-4448 #515 Also updates: * libpng as previous version is now unavailable (?) * libjpeg as previous version was pre-release	2016-07-18 12:07:28 +01:00
Matt Hirsch	c39a9b8de9	Prevent boolean errors during extract operation (#509 ) (#511 )	2016-07-16 10:56:15 +01:00
Matt Hirsch	15a577863a	Ensure boolean, bandbool, extractChannel ops occur before sRGB conversion (#504 )	2016-07-13 19:20:50 +01:00
Lovell Fuller	2d500554c1	Release v0.15.1	2016-07-12 16:06:38 +01:00
Lovell Fuller	c42fb97419	Refactor pipeline to use common 16-bit detection methods	2016-07-11 23:03:45 +01:00
Lovell Fuller	d1d6155fd1	Increase unit test coverage for recently added operations Switch param validation to use internal functions	2016-07-11 22:23:15 +01:00
Lovell Fuller	ff8c42e894	Changelog/doc/test updates for various new operations Dependency version bumps	2016-07-11 15:52:30 +01:00
Lovell Fuller	e10aeb29eb	Add missing include introduced by `fee3d88`	2016-07-11 14:05:26 +01:00
Lovell Fuller	fee3d882c7	Prevent GC of Buffer object vector via accumulate/lambda. Removes need for naming Buffers and separate container struct.	2016-07-11 13:07:32 +01:00
Matt Hirsch	d17e8d3450	Add boolean feature for bitwise image operations (#501 )	2016-07-11 09:51:43 +01:00
Lovell Fuller	99f960bf56	Docs: Clarify trimming of existing cache entries #487	2016-07-11 09:42:19 +01:00
Matt Hirsch	83d8847f57	Add extractChannel operation to extract a channel from an image (#497 )	2016-07-09 16:48:30 +01:00
Matt Hirsch	f672f86b53	Add ability to read and write native vips .v files (#500 )	2016-07-09 16:21:16 +01:00
Kleis Auke Wolthuizen	b69627891d	Add trim operation to remove "boring" edges (#491 #492 )	2016-07-08 22:19:10 +01:00
Matt Hirsch	673d8278b5	Add a unit test for extract area out of bounds (#498 )	2016-07-08 20:52:33 +01:00
Lovell Fuller	8dd554b935	Use "previous" AppVeyor env as temp workaround for nodejs/node-gyp#952	2016-07-08 13:15:24 +01:00
Matt Hirsch	65b7f7d7d5	Add bandbool feature for channel-wise boolean operations (#496 )	2016-07-07 21:03:49 +01:00
Matt Hirsch	a982cfdb20	Update docs to better reflect output of RAW data (#499 )	2016-07-07 20:50:59 +01:00
Lovell Fuller	7689fbe54d	Ensure --sharp-cxx11 flag is passed through #456 #494 node-gyp replaces dashes with underscores	2016-07-06 10:40:53 +01:00
Lovell Fuller	c9d32e22d3	Docs, changelog for top/left overlayWith offset #473	2016-07-05 11:17:41 +01:00
Rahul Nanwani	278273b5c3	Add top/left offset support to overlayWith operation (#473 )	2016-07-05 10:12:02 +01:00
Lovell Fuller	a5d85b8a54	Changelog plus tidy of code/docs for convolve operation	2016-07-04 22:13:47 +01:00
Lovell Fuller	4c172d25f6	Allow images with alpha channel to use LAB sharpen #490	2016-07-04 21:33:44 +01:00
Matt Hirsch	b70a7d9a3b	Add convolve operation for kernel-based convolution (#479 )	2016-07-04 20:48:00 +01:00
Lovell Fuller	ba5a8b44ed	Changelog, credit and doc tidy for improved threshold operation	2016-07-04 10:41:13 +01:00
Lovell Fuller	91e1ed1314	Ensure ICC profiles are licenced for distribution #486	2016-07-04 10:13:16 +01:00
Matt Hirsch	85f20c6e1b	Add greyscale option to threshold operation (#480 )	2016-07-03 19:32:07 +01:00
Lovell Fuller	4b98dbb454	Docs: reduce ambiguity of tile-based ZIP file output #474	2016-06-26 13:58:49 +01:00
Lovell Fuller	c3ad4fbdaa	Document new cutout option of overlayWith feature #435	2016-06-26 13:53:20 +01:00
Kleis Auke Wolthuizen	2e9cd83ed2	Add support for clipping/cutting out (#435 ) (#448 ) USAGE: overlayWith('overlayimage.png', { cutout: true } )	2016-06-25 16:48:01 +01:00
Lovell Fuller	f1ead06645	Update test expectations/thresholds previously failing on OS X. Remove Node v5 from CI builds.	2016-06-14 22:25:27 +01:00
Teoh Han Hui	d486eaad03	Document breaking change in extract API in v0.14.0 (#465 ) Deprecated style of calling extract was removed in `2034efc`	2016-06-14 10:46:19 +01:00
Lovell Fuller	7d261a147d	Ensure scaling factors are calculated independently #452 Fixes bug introduced in v0.15.0 where, if the shrink operation rounded up along one dimension, it could then also round up the reduce operation on the same axis, creating a small stretch effect.	2016-06-13 23:03:45 +01:00
Lovell Fuller	61038888c4	Document --sharp-cxx11 install flag #456	2016-06-11 08:28:27 +01:00
Jérémy Lal	39040fb9a0	Allow node-gyp configure --sharp-cxx11=1 (#456 ) Can also be set in .npmrc. Closes: #442	2016-06-08 17:42:46 +01:00
Lovell Fuller	4f3262c328	List licence details for all library dependencies	2016-05-27 23:17:06 +01:00
Lovell Fuller	69126a7c5f	Add docs and credits for #439 and #443	2016-05-27 21:33:07 +01:00
lemnisk8	62554b766f	Add support for repeated/tiled overlay image (#443 ) USAGE: overlayWith('overlayimage.png', { tile: true, gravity: northwest} ) When using the tile option, the gravity option is applied to the extracted part of the tiled overlay image.	2016-05-26 16:42:17 +01:00
frulo	e699e36270	Add alpha channel, if required, before extend operation (#439 )	2016-05-26 09:46:14 +01:00
Lovell Fuller	331926dc3c	Concat Stream-based input in single operation for ~+3% perf and less GC #429	2016-05-24 21:04:18 +01:00