diff --git a/docs/api-operation.md b/docs/api-operation.md
index 5a6d26e8..6efae330 100644
--- a/docs/api-operation.md
+++ b/docs/api-operation.md
@@ -65,6 +65,61 @@ The use of `flop` implies the removal of the EXIF `Orientation` tag, if any.
 
 Returns **Sharp** 
 
+## affine
+
+Perform an affine transform on an image. This operation will always occur after resizing, extraction and rotation, if any.
+
+You must provide an array of length 4 or a 2x2 affine transformation matrix.
+By default, new pixels are filled with a black background. You can provide a background color with the `background` option.
+A particular interpolator may also be specified. Set the `interpolator` option to an attribute of the `sharp.interpolator` Object e.g. `sharp.interpolator.nohalo`.
+
+In the case of a 2x2 matrix, the transform is:
+
+-   X = `matrix[0, 0]` \* (x + `idx`) + `matrix[0, 1]` \* (y + `idy`) + `odx`
+-   Y = `matrix[1, 0]` \* (x + `idx`) + `matrix[1, 1]` \* (y + `idy`) + `ody`
+
+where:
+
+-   x and y are the coordinates in input image.
+-   X and Y are the coordinates in output image.
+-   (0,0) is the upper left corner.
+
+### Parameters
+
+-   `matrix` **([Array][7]<[Array][7]<[number][1]>> | [Array][7]<[number][1]>)** affine transformation matrix
+-   `options` **[Object][2]?** if present, is an Object with optional attributes.
+    -   `options.background` **([String][3] \| [Object][2])** parsed by the [color][4] module to extract values for red, green, blue and alpha. (optional, default `"#000000"`)
+    -   `options.idx` **[Number][1]** input horizontal offset (optional, default `0`)
+    -   `options.idy` **[Number][1]** input vertical offset (optional, default `0`)
+    -   `options.odx` **[Number][1]** output horizontal offset (optional, default `0`)
+    -   `options.ody` **[Number][1]** output vertical offset (optional, default `0`)
+    -   `options.interpolator` **[String][3]** interpolator (optional, default `sharp.interpolators.bicubic`)
+
+### Examples
+
+```javascript
+const pipeline = sharp()
+  .affine([[1, 0.3], [0.1, 0.7]], {
+     background: 'white',
+     interpolate: sharp.interpolators.nohalo
+  })
+  .toBuffer((err, outputBuffer, info) => {
+     // outputBuffer contains the transformed image
+     // info.width and info.height contain the new dimensions
+  });
+
+inputStream
+  .pipe(pipeline);
+```
+
+-   Throws **[Error][5]** Invalid parameters
+
+Returns **Sharp** 
+
+**Meta**
+
+-   **since**: 0.27.0
+
 ## sharpen
 
 Sharpen the image.
diff --git a/docs/api-utility.md b/docs/api-utility.md
index 9b450c18..01cfdb6b 100644
--- a/docs/api-utility.md
+++ b/docs/api-utility.md
@@ -12,6 +12,36 @@ console.log(sharp.format);
 
 Returns **[Object][1]** 
 
+## interpolators
+
+An Object containing the available interpolators and their proper values
+
+Type: [string][2]
+
+### nearest
+
+[Nearest neighbour interpolation][3]. Suitable for image enlargement only.
+
+### bilinear
+
+[Bilinear interpolation][4]. Faster than bicubic but with less smooth results.
+
+### bicubic
+
+[Bicubic interpolation][5] (the default).
+
+### locallyBoundedBicubic
+
+[LBB interpolation][6]. Prevents some "[acutance][7]" but typically reduces performance by a factor of 2.
+
+### nohalo
+
+[Nohalo interpolation][8]. Prevents acutance but typically reduces performance by a factor of 3.
+
+### vertexSplitQuadraticBasisSpline
+
+[VSQBS interpolation][9]. Prevents "staircasing" when enlarging.
+
 ## versions
 
 An Object containing the version numbers of libvips and its dependencies.
@@ -31,10 +61,10 @@ useful for determining how much working memory is required for a particular task
 
 ### Parameters
 
--   `options` **([Object][1] \| [boolean][2])** Object with the following attributes, or boolean where true uses default cache settings and false removes all caching (optional, default `true`)
-    -   `options.memory` **[number][3]** is the maximum memory in MB to use for this cache (optional, default `50`)
-    -   `options.files` **[number][3]** is the maximum number of files to hold open (optional, default `20`)
-    -   `options.items` **[number][3]** is the maximum number of operations to cache (optional, default `100`)
+-   `options` **([Object][1] \| [boolean][10])** Object with the following attributes, or boolean where true uses default cache settings and false removes all caching (optional, default `true`)
+    -   `options.memory` **[number][11]** is the maximum memory in MB to use for this cache (optional, default `50`)
+    -   `options.files` **[number][11]** is the maximum number of files to hold open (optional, default `20`)
+    -   `options.items` **[number][11]** is the maximum number of operations to cache (optional, default `100`)
 
 ### Examples
 
@@ -64,7 +94,7 @@ This method always returns the current concurrency.
 
 ### Parameters
 
--   `concurrency` **[number][3]?** 
+-   `concurrency` **[number][11]?** 
 
 ### Examples
 
@@ -74,7 +104,7 @@ sharp.concurrency(2); // 2
 sharp.concurrency(0); // 4
 ```
 
-Returns **[number][3]** concurrency
+Returns **[number][11]** concurrency
 
 ## queue
 
@@ -116,7 +146,7 @@ by taking advantage of the SIMD vector unit of the CPU, e.g. Intel SSE and ARM N
 
 ### Parameters
 
--   `simd` **[boolean][2]**  (optional, default `true`)
+-   `simd` **[boolean][10]**  (optional, default `true`)
 
 ### Examples
 
@@ -130,10 +160,26 @@ const simd = sharp.simd(false);
 // prevent libvips from using liborc at runtime
 ```
 
-Returns **[boolean][2]** 
+Returns **[boolean][10]** 
 
 [1]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
 
-[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
 
-[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+[3]: http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation
+
+[4]: http://en.wikipedia.org/wiki/Bilinear_interpolation
+
+[5]: http://en.wikipedia.org/wiki/Bicubic_interpolation
+
+[6]: https://github.com/jcupitt/libvips/blob/master/libvips/resample/lbb.cpp#L100
+
+[7]: http://en.wikipedia.org/wiki/Acutance
+
+[8]: http://eprints.soton.ac.uk/268086/
+
+[9]: https://github.com/jcupitt/libvips/blob/master/libvips/resample/vsqbs.cpp#L48
+
+[10]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
+
+[11]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
diff --git a/docs/search-index.json b/docs/search-index.json
index 44678a15..deaea0d4 100644
--- a/docs/search-index.json
+++ b/docs/search-index.json
@@ -1 +1 @@
-[{"t":"Prerequisites","d":"Node.js v10.16.0","k":"prerequisites node","l":"/install#prerequisites"},{"t":"Prebuilt binaries","d":"Ready-compiled sharp and libvips binaries are provided for use with Node.js v10.16.0 on the most common platforms macOS x64 10.13 Linux x64","k":"prebuilt binaries ready compiled sharp libvips binaries provided node most common platforms macos linux","l":"/install#prebuilt-binaries"},{"t":"Common problems","d":"The architecture and platform of Node.js used for npm install must be the same as the architecture and platform of Node.js used at runtime.","k":"common problems architecture platform node used npm install must same architecture platform node used runtime","l":"/install#common-problems"},{"t":"Custom libvips","d":"To use a custom, globally-installed version of libvips instead of the provided binaries, make sure it is at least the version listed under c","k":"custom libvips custom globally installed version libvips instead provided binaries make sure least version listed under","l":"/install#custom-libvips"},{"t":"Building from source","d":"This module will be compiled from source at npm install time when a globally-installed libvips is detected set the SHARP_IGNORE_GLOBAL_LIBVI","k":"building source module compiled source npm install time globally installed libvips detected sharpignoregloballibvi","l":"/install#building-from-source"},{"t":"Custom prebuilt binaries","d":"This is an advanced approach that most people will not require. To install the prebuilt sharp binaries from a custom URL, set the sharp_bina","k":"custom prebuilt binaries advanced approach most people require install prebuilt sharp binaries custom url sharpbina","l":"/install#custom-prebuilt-binaries"},{"t":"Chinese mirror","d":"Alibaba provide a mirror site based in China containing binaries for both sharp and libvips. To use this either set the following configurat","k":"chinese mirror alibaba provide mirror site based china containing binaries both sharp libvips following configurat","l":"/install#chinese-mirror"},{"t":"FreeBSD","d":"The vips package must be installed before npm install is run. sh pkg install -y pkgconf vips sh cd /usr/ports/graphics/vips/ make install cl","k":"freebsd vips package must installed before npm install run pkg install pkgconf vips usr ports graphics vips make install","l":"/install#freebsd"},{"t":"Heroku","d":"Add the jemalloc buildpack to reduce the effects of memory fragmentation. Set NODE_MODULES_CACHE","k":"heroku add jemalloc buildpack reduce effects memory fragmentation nodemodulescache","l":"/install#heroku"},{"t":"AWS Lambda","d":"Set the Lambda runtime to nodejs12.x. The binaries in the node_modules directory of the deployment package must be for the Linux x64 platfor","k":"aws lambda lambda runtime nodejs binaries nodemodules directory deployment package must linux platfor","l":"/install#aws-lambda"},{"t":"Electron","d":"Electron provides versions of the V8 JavaScript engine that are incompatible with Node.js. To ensure the correct binaries are used, run the","k":"electron electron provides versions javascript engine incompatible node ensure correct binaries used run","l":"/install#electron"},{"t":"Worker threads","d":"The main thread must call requiresharp before worker threads are created to ensure shared libraries remain loaded in memory until after all","k":"worker threads main thread must call requiresharp before worker threads created ensure shared libraries remain loaded memory until after","l":"/install#worker-threads"},{"t":"Sharp","d":"Constructor factory to create an instance of sharp, to which further methods are chained.","k":"sharp constructor factory create instance sharp further methods chained","l":"/api-constructor#sharp"},{"t":"clone","d":"Take a snapshot of the Sharp instance, returning a new instance. Cloned instances inherit the input of their parent instance. This allows mu","k":"clone take snapshot sharp instance returning new instance cloned instances inherit input parent instance allows","l":"/api-constructor#clone"},{"t":"metadata","d":"Fast access to uncached image metadata without decoding any compressed image data. A Promise is returned when callback is not provided.","k":"metadata fast access uncached image metadata without decoding compressed image data promise returned callback provided","l":"/api-input#metadata"},{"t":"stats","d":"Access to pixel-derived image statistics for every channel in the image. A Promise is returned when callback is not provided.","k":"stats access pixel derived image statistics every channel image promise returned callback provided","l":"/api-input#stats"},{"t":"toFile","d":"Write output image data to a file.","k":"tofile write output image data file","l":"/api-output#tofile"},{"t":"toBuffer","d":"Write output to a Buffer. JPEG, PNG, WebP, TIFF and RAW output are supported.","k":"tobuffer write output buffer jpeg png webp tiff raw output supported","l":"/api-output#tobuffer"},{"t":"withMetadata","d":"Include all metadata EXIF, XMP, IPTC from the input image in the output image. This will also convert to and add a web-friendly sRGB ICC pro","k":"withmetadata include metadata exif xmp iptc input image output image also convert add web friendly srgb icc pro","l":"/api-output#withmetadata"},{"t":"toFormat","d":"Force output to a given format.","k":"toformat force output given format","l":"/api-output#toformat"},{"t":"jpeg","d":"Use these JPEG options for output image.","k":"jpeg jpeg options output image","l":"/api-output#jpeg"},{"t":"png","d":"Use these PNG options for output image.","k":"png png options output image","l":"/api-output#png"},{"t":"webp","d":"Use these WebP options for output image.","k":"webp webp options output image","l":"/api-output#webp"},{"t":"gif","d":"Use these GIF options for output image.","k":"gif gif options output image","l":"/api-output#gif"},{"t":"tiff","d":"Use these TIFF options for output image.","k":"tiff tiff options output image","l":"/api-output#tiff"},{"t":"heif","d":"Use these HEIF options for output image.","k":"heif heif options output image","l":"/api-output#heif"},{"t":"raw","d":"Force output to be raw, uncompressed, 8-bit unsigned integer unit8 pixel data. Pixel ordering is left-to-right, top-to-bottom, without paddi","k":"raw force output raw uncompressed bit unsigned integer unit pixel data pixel ordering left right top bottom without paddi","l":"/api-output#raw"},{"t":"tile","d":"Use tile-based deep zoom image pyramid output. Set the format and options for tile images via the toFormat, jpeg, png or webp functions. Use","k":"tile tile based deep zoom image pyramid output format options tile images via toformat jpeg png webp functions","l":"/api-output#tile"},{"t":"resize","d":"Resize image to width, height or width x height.","k":"resize resize image width height width height","l":"/api-resize#resize"},{"t":"extend","d":"Extends/pads the edges of the image with the provided background colour. This operation will always occur after resizing and extraction, if","k":"extend extends pads edges image provided background colour operation occur after resizing extraction","l":"/api-resize#extend"},{"t":"extract","d":"Extract/crop a region of the image.","k":"extract extract crop region image","l":"/api-resize#extract"},{"t":"trim","d":"Trim boring pixels from all edges that contain values similar to the top-left pixel. Images consisting entirely of a single colour will calc","k":"trim trim boring pixels edges contain values similar top left pixel images consisting entirely single colour calc","l":"/api-resize#trim"},{"t":"composite","d":"Composite images over the processed resized, extracted etc. image.","k":"composite composite images processed resized extracted image","l":"/api-composite#composite"},{"t":"rotate","d":"Rotate the output image by either an explicit angle or auto-orient based on the EXIF Orientation tag.","k":"rotate rotate output image explicit angle auto orient based exif orientation tag","l":"/api-operation#rotate"},{"t":"flip","d":"Flip the image about the vertical Y axis. This always occurs after rotation, if any. The use of flip implies the removal of the EXIF Orienta","k":"flip flip image vertical axis occurs after rotation flip implies removal exif orienta","l":"/api-operation#flip"},{"t":"flop","d":"Flop the image about the horizontal X axis. This always occurs after rotation, if any. The use of flop implies the removal of the EXIF Orien","k":"flop flop image horizontal axis occurs after rotation flop implies removal exif orien","l":"/api-operation#flop"},{"t":"sharpen","d":"Sharpen the image. When used without parameters, performs a fast, mild sharpen of the output image. When a sigma is provided, performs a slo","k":"sharpen sharpen image used without parameters performs fast mild sharpen output image sigma provided performs slo","l":"/api-operation#sharpen"},{"t":"median","d":"Apply median filter. When used without parameters the default window is 3x3.","k":"median apply median filter used without parameters default window","l":"/api-operation#median"},{"t":"blur","d":"Blur the image. When used without parameters, performs a fast, mild blur of the output image. When a sigma is provided, performs a slower, m","k":"blur blur image used without parameters performs fast mild blur output image sigma provided performs slower","l":"/api-operation#blur"},{"t":"flatten","d":"Merge alpha transparency channel, if any, with a background.","k":"flatten merge alpha transparency channel background","l":"/api-operation#flatten"},{"t":"gamma","d":"Apply a gamma correction by reducing the encoding darken pre-resize at a factor of 1/gamma then increasing the encoding brighten post-resize","k":"gamma apply gamma correction reducing encoding darken pre resize factor gamma then increasing encoding brighten post resize","l":"/api-operation#gamma"},{"t":"negate","d":"Produce the negative of the image.","k":"negate produce negative image","l":"/api-operation#negate"},{"t":"normalise","d":"Enhance output image contrast by stretching its luminance to cover the full dynamic range.","k":"normalise enhance output image contrast stretching luminance cover full dynamic range","l":"/api-operation#normalise"},{"t":"normalize","d":"Alternative spelling of normalise.","k":"normalize alternative spelling normalise","l":"/api-operation#normalize"},{"t":"convolve","d":"Convolve the image with the specified kernel.","k":"convolve convolve image specified kernel","l":"/api-operation#convolve"},{"t":"threshold","d":"Any pixel value greather than or equal to the threshold value will be set to 255, otherwise it will be set to 0.","k":"threshold pixel value greather than equal threshold value otherwise","l":"/api-operation#threshold"},{"t":"boolean","d":"Perform a bitwise boolean operation with operand image.","k":"boolean perform bitwise boolean operation operand image","l":"/api-operation#boolean"},{"t":"linear","d":"Apply the linear formula a input b to the image levels adjustment","k":"linear apply linear formula input image levels adjustment","l":"/api-operation#linear"},{"t":"recomb","d":"Recomb the image with the specified matrix.","k":"recomb recomb image specified matrix","l":"/api-operation#recomb"},{"t":"modulate","d":"Transforms the image using brightness, saturation and hue rotation.","k":"modulate transforms image brightness saturation hue rotation","l":"/api-operation#modulate"},{"t":"removeAlpha","d":"Remove alpha channel, if any. This is a no-op if the image does not have an alpha channel.","k":"removealpha remove alpha channel image alpha channel","l":"/api-channel#removealpha"},{"t":"ensureAlpha","d":"Ensure alpha channel, if missing. The added alpha channel will be fully opaque. This is a no-op if the image already has an alpha channel.","k":"ensurealpha ensure alpha channel missing added alpha channel fully opaque image alpha channel","l":"/api-channel#ensurealpha"},{"t":"extractChannel","d":"Extract a single channel from a multi-channel image.","k":"extractchannel extract single channel multi channel image","l":"/api-channel#extractchannel"},{"t":"joinChannel","d":"Join one or more channels to the image. The meaning of the added channels depends on the output colourspace, set with toColourspace. By defa","k":"joinchannel join one channels image meaning added channels depends output colourspace tocolourspace defa","l":"/api-channel#joinchannel"},{"t":"bandbool","d":"Perform a bitwise boolean operation on all input image channels bands to produce a single channel output image.","k":"bandbool perform bitwise boolean operation input image channels bands produce single channel output image","l":"/api-channel#bandbool"},{"t":"tint","d":"Tint the image using the provided chroma while preserving the image luminance. An alpha channel may be present and will be unchanged by the","k":"tint tint image provided chroma while preserving image luminance alpha channel present unchanged","l":"/api-colour#tint"},{"t":"greyscale","d":"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,","k":"greyscale convert bit greyscale shades grey linear operation input image non linear colour space such srgb","l":"/api-colour#greyscale"},{"t":"grayscale","d":"Alternative spelling of greyscale.","k":"grayscale alternative spelling greyscale","l":"/api-colour#grayscale"},{"t":"toColourspace","d":"Set the output colourspace. By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.","k":"tocolourspace output colourspace default output image web friendly srgb additional channels interpreted alpha channels","l":"/api-colour#tocolourspace"},{"t":"toColorspace","d":"Alternative spelling of toColourspace.","k":"tocolorspace alternative spelling tocolourspace","l":"/api-colour#tocolorspace"},{"t":"format","d":"An Object containing nested boolean values representing the available input and output formats/methods.","k":"format object containing nested boolean values representing available input output formats methods","l":"/api-utility#format"},{"t":"versions","d":"An Object containing the version numbers of libvips and its dependencies.","k":"versions object containing version numbers libvips dependencies","l":"/api-utility#versions"},{"t":"cache","d":"Gets or, when options are provided, sets the limits of _libvips_ operation cache. Existing entries in the cache will be trimmed after any ch","k":"cache options provided limits libvips operation cache existing entries cache trimmed after","l":"/api-utility#cache"},{"t":"concurrency","d":"Gets or, when a concurrency is provided, sets the number of threads _libvips_ should create to process each image. The default value is the","k":"concurrency concurrency provided number threads libvips create process image default value","l":"/api-utility#concurrency"},{"t":"queue","d":"An EventEmitter that emits a change event when a task is either","k":"queue eventemitter emits change event task","l":"/api-utility#queue"},{"t":"counters","d":"Provides access to internal task counters.","k":"counters provides access internal task counters","l":"/api-utility#counters"},{"t":"simd","d":"Get and set use of SIMD vector unit instructions. Requires libvips to have been compiled with liborc support.","k":"simd simd vector unit instructions requires libvips compiled liborc support","l":"/api-utility#simd"}]
\ No newline at end of file
+[{"t":"Prerequisites","d":"Node.js v10.16.0","k":"prerequisites node","l":"/install#prerequisites"},{"t":"Prebuilt binaries","d":"Ready-compiled sharp and libvips binaries are provided for use with Node.js v10.16.0 on the most common platforms macOS x64 10.13 Linux x64","k":"prebuilt binaries ready compiled sharp libvips binaries provided node most common platforms macos linux","l":"/install#prebuilt-binaries"},{"t":"Common problems","d":"The architecture and platform of Node.js used for npm install must be the same as the architecture and platform of Node.js used at runtime.","k":"common problems architecture platform node used npm install must same architecture platform node used runtime","l":"/install#common-problems"},{"t":"Custom libvips","d":"To use a custom, globally-installed version of libvips instead of the provided binaries, make sure it is at least the version listed under c","k":"custom libvips custom globally installed version libvips instead provided binaries make sure least version listed under","l":"/install#custom-libvips"},{"t":"Building from source","d":"This module will be compiled from source at npm install time when a globally-installed libvips is detected set the SHARP_IGNORE_GLOBAL_LIBVI","k":"building source module compiled source npm install time globally installed libvips detected sharpignoregloballibvi","l":"/install#building-from-source"},{"t":"Custom prebuilt binaries","d":"This is an advanced approach that most people will not require. To install the prebuilt sharp binaries from a custom URL, set the sharp_bina","k":"custom prebuilt binaries advanced approach most people require install prebuilt sharp binaries custom url sharpbina","l":"/install#custom-prebuilt-binaries"},{"t":"Chinese mirror","d":"Alibaba provide a mirror site based in China containing binaries for both sharp and libvips. To use this either set the following configurat","k":"chinese mirror alibaba provide mirror site based china containing binaries both sharp libvips following configurat","l":"/install#chinese-mirror"},{"t":"FreeBSD","d":"The vips package must be installed before npm install is run. sh pkg install -y pkgconf vips sh cd /usr/ports/graphics/vips/ make install cl","k":"freebsd vips package must installed before npm install run pkg install pkgconf vips usr ports graphics vips make install","l":"/install#freebsd"},{"t":"Heroku","d":"Add the jemalloc buildpack to reduce the effects of memory fragmentation. Set NODE_MODULES_CACHE","k":"heroku add jemalloc buildpack reduce effects memory fragmentation nodemodulescache","l":"/install#heroku"},{"t":"AWS Lambda","d":"Set the Lambda runtime to nodejs12.x. The binaries in the node_modules directory of the deployment package must be for the Linux x64 platfor","k":"aws lambda lambda runtime nodejs binaries nodemodules directory deployment package must linux platfor","l":"/install#aws-lambda"},{"t":"Electron","d":"Electron provides versions of the V8 JavaScript engine that are incompatible with Node.js. To ensure the correct binaries are used, run the","k":"electron electron provides versions javascript engine incompatible node ensure correct binaries used run","l":"/install#electron"},{"t":"Worker threads","d":"The main thread must call requiresharp before worker threads are created to ensure shared libraries remain loaded in memory until after all","k":"worker threads main thread must call requiresharp before worker threads created ensure shared libraries remain loaded memory until after","l":"/install#worker-threads"},{"t":"Sharp","d":"Constructor factory to create an instance of sharp, to which further methods are chained.","k":"sharp constructor factory create instance sharp further methods chained","l":"/api-constructor#sharp"},{"t":"clone","d":"Take a snapshot of the Sharp instance, returning a new instance. Cloned instances inherit the input of their parent instance. This allows mu","k":"clone take snapshot sharp instance returning new instance cloned instances inherit input parent instance allows","l":"/api-constructor#clone"},{"t":"metadata","d":"Fast access to uncached image metadata without decoding any compressed image data. A Promise is returned when callback is not provided.","k":"metadata fast access uncached image metadata without decoding compressed image data promise returned callback provided","l":"/api-input#metadata"},{"t":"stats","d":"Access to pixel-derived image statistics for every channel in the image. A Promise is returned when callback is not provided.","k":"stats access pixel derived image statistics every channel image promise returned callback provided","l":"/api-input#stats"},{"t":"toFile","d":"Write output image data to a file.","k":"tofile write output image data file","l":"/api-output#tofile"},{"t":"toBuffer","d":"Write output to a Buffer. JPEG, PNG, WebP, TIFF and RAW output are supported.","k":"tobuffer write output buffer jpeg png webp tiff raw output supported","l":"/api-output#tobuffer"},{"t":"withMetadata","d":"Include all metadata EXIF, XMP, IPTC from the input image in the output image. This will also convert to and add a web-friendly sRGB ICC pro","k":"withmetadata include metadata exif xmp iptc input image output image also convert add web friendly srgb icc pro","l":"/api-output#withmetadata"},{"t":"toFormat","d":"Force output to a given format.","k":"toformat force output given format","l":"/api-output#toformat"},{"t":"jpeg","d":"Use these JPEG options for output image.","k":"jpeg jpeg options output image","l":"/api-output#jpeg"},{"t":"png","d":"Use these PNG options for output image.","k":"png png options output image","l":"/api-output#png"},{"t":"webp","d":"Use these WebP options for output image.","k":"webp webp options output image","l":"/api-output#webp"},{"t":"gif","d":"Use these GIF options for output image.","k":"gif gif options output image","l":"/api-output#gif"},{"t":"tiff","d":"Use these TIFF options for output image.","k":"tiff tiff options output image","l":"/api-output#tiff"},{"t":"heif","d":"Use these HEIF options for output image.","k":"heif heif options output image","l":"/api-output#heif"},{"t":"raw","d":"Force output to be raw, uncompressed, 8-bit unsigned integer unit8 pixel data. Pixel ordering is left-to-right, top-to-bottom, without paddi","k":"raw force output raw uncompressed bit unsigned integer unit pixel data pixel ordering left right top bottom without paddi","l":"/api-output#raw"},{"t":"tile","d":"Use tile-based deep zoom image pyramid output. Set the format and options for tile images via the toFormat, jpeg, png or webp functions. Use","k":"tile tile based deep zoom image pyramid output format options tile images via toformat jpeg png webp functions","l":"/api-output#tile"},{"t":"resize","d":"Resize image to width, height or width x height.","k":"resize resize image width height width height","l":"/api-resize#resize"},{"t":"extend","d":"Extends/pads the edges of the image with the provided background colour. This operation will always occur after resizing and extraction, if","k":"extend extends pads edges image provided background colour operation occur after resizing extraction","l":"/api-resize#extend"},{"t":"extract","d":"Extract/crop a region of the image.","k":"extract extract crop region image","l":"/api-resize#extract"},{"t":"trim","d":"Trim boring pixels from all edges that contain values similar to the top-left pixel. Images consisting entirely of a single colour will calc","k":"trim trim boring pixels edges contain values similar top left pixel images consisting entirely single colour calc","l":"/api-resize#trim"},{"t":"composite","d":"Composite images over the processed resized, extracted etc. image.","k":"composite composite images processed resized extracted image","l":"/api-composite#composite"},{"t":"rotate","d":"Rotate the output image by either an explicit angle or auto-orient based on the EXIF Orientation tag.","k":"rotate rotate output image explicit angle auto orient based exif orientation tag","l":"/api-operation#rotate"},{"t":"flip","d":"Flip the image about the vertical Y axis. This always occurs after rotation, if any. The use of flip implies the removal of the EXIF Orienta","k":"flip flip image vertical axis occurs after rotation flip implies removal exif orienta","l":"/api-operation#flip"},{"t":"flop","d":"Flop the image about the horizontal X axis. This always occurs after rotation, if any. The use of flop implies the removal of the EXIF Orien","k":"flop flop image horizontal axis occurs after rotation flop implies removal exif orien","l":"/api-operation#flop"},{"t":"affine","d":"Perform an affine transform on an image. This operation will always occur after resizing, extraction and rotation, if any.","k":"affine perform affine transform image operation occur after resizing extraction rotation","l":"/api-operation#affine"},{"t":"sharpen","d":"Sharpen the image. When used without parameters, performs a fast, mild sharpen of the output image. When a sigma is provided, performs a slo","k":"sharpen sharpen image used without parameters performs fast mild sharpen output image sigma provided performs slo","l":"/api-operation#sharpen"},{"t":"median","d":"Apply median filter. When used without parameters the default window is 3x3.","k":"median apply median filter used without parameters default window","l":"/api-operation#median"},{"t":"blur","d":"Blur the image. When used without parameters, performs a fast, mild blur of the output image. When a sigma is provided, performs a slower, m","k":"blur blur image used without parameters performs fast mild blur output image sigma provided performs slower","l":"/api-operation#blur"},{"t":"flatten","d":"Merge alpha transparency channel, if any, with a background.","k":"flatten merge alpha transparency channel background","l":"/api-operation#flatten"},{"t":"gamma","d":"Apply a gamma correction by reducing the encoding darken pre-resize at a factor of 1/gamma then increasing the encoding brighten post-resize","k":"gamma apply gamma correction reducing encoding darken pre resize factor gamma then increasing encoding brighten post resize","l":"/api-operation#gamma"},{"t":"negate","d":"Produce the negative of the image.","k":"negate produce negative image","l":"/api-operation#negate"},{"t":"normalise","d":"Enhance output image contrast by stretching its luminance to cover the full dynamic range.","k":"normalise enhance output image contrast stretching luminance cover full dynamic range","l":"/api-operation#normalise"},{"t":"normalize","d":"Alternative spelling of normalise.","k":"normalize alternative spelling normalise","l":"/api-operation#normalize"},{"t":"convolve","d":"Convolve the image with the specified kernel.","k":"convolve convolve image specified kernel","l":"/api-operation#convolve"},{"t":"threshold","d":"Any pixel value greather than or equal to the threshold value will be set to 255, otherwise it will be set to 0.","k":"threshold pixel value greather than equal threshold value otherwise","l":"/api-operation#threshold"},{"t":"boolean","d":"Perform a bitwise boolean operation with operand image.","k":"boolean perform bitwise boolean operation operand image","l":"/api-operation#boolean"},{"t":"linear","d":"Apply the linear formula a input b to the image levels adjustment","k":"linear apply linear formula input image levels adjustment","l":"/api-operation#linear"},{"t":"recomb","d":"Recomb the image with the specified matrix.","k":"recomb recomb image specified matrix","l":"/api-operation#recomb"},{"t":"modulate","d":"Transforms the image using brightness, saturation and hue rotation.","k":"modulate transforms image brightness saturation hue rotation","l":"/api-operation#modulate"},{"t":"removeAlpha","d":"Remove alpha channel, if any. This is a no-op if the image does not have an alpha channel.","k":"removealpha remove alpha channel image alpha channel","l":"/api-channel#removealpha"},{"t":"ensureAlpha","d":"Ensure alpha channel, if missing. The added alpha channel will be fully opaque. This is a no-op if the image already has an alpha channel.","k":"ensurealpha ensure alpha channel missing added alpha channel fully opaque image alpha channel","l":"/api-channel#ensurealpha"},{"t":"extractChannel","d":"Extract a single channel from a multi-channel image.","k":"extractchannel extract single channel multi channel image","l":"/api-channel#extractchannel"},{"t":"joinChannel","d":"Join one or more channels to the image. The meaning of the added channels depends on the output colourspace, set with toColourspace. By defa","k":"joinchannel join one channels image meaning added channels depends output colourspace tocolourspace defa","l":"/api-channel#joinchannel"},{"t":"bandbool","d":"Perform a bitwise boolean operation on all input image channels bands to produce a single channel output image.","k":"bandbool perform bitwise boolean operation input image channels bands produce single channel output image","l":"/api-channel#bandbool"},{"t":"tint","d":"Tint the image using the provided chroma while preserving the image luminance. An alpha channel may be present and will be unchanged by the","k":"tint tint image provided chroma while preserving image luminance alpha channel present unchanged","l":"/api-colour#tint"},{"t":"greyscale","d":"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,","k":"greyscale convert bit greyscale shades grey linear operation input image non linear colour space such srgb","l":"/api-colour#greyscale"},{"t":"grayscale","d":"Alternative spelling of greyscale.","k":"grayscale alternative spelling greyscale","l":"/api-colour#grayscale"},{"t":"toColourspace","d":"Set the output colourspace. By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.","k":"tocolourspace output colourspace default output image web friendly srgb additional channels interpreted alpha channels","l":"/api-colour#tocolourspace"},{"t":"toColorspace","d":"Alternative spelling of toColourspace.","k":"tocolorspace alternative spelling tocolourspace","l":"/api-colour#tocolorspace"},{"t":"format","d":"An Object containing nested boolean values representing the available input and output formats/methods.","k":"format object containing nested boolean values representing available input output formats methods","l":"/api-utility#format"},{"t":"interpolators","d":"An Object containing the available interpolators and their proper values","k":"interpolators object containing available interpolators proper values","l":"/api-utility#interpolators"},{"t":"versions","d":"An Object containing the version numbers of libvips and its dependencies.","k":"versions object containing version numbers libvips dependencies","l":"/api-utility#versions"},{"t":"cache","d":"Gets or, when options are provided, sets the limits of _libvips_ operation cache. Existing entries in the cache will be trimmed after any ch","k":"cache options provided limits libvips operation cache existing entries cache trimmed after","l":"/api-utility#cache"},{"t":"concurrency","d":"Gets or, when a concurrency is provided, sets the number of threads _libvips_ should create to process each image. The default value is the","k":"concurrency concurrency provided number threads libvips create process image default value","l":"/api-utility#concurrency"},{"t":"queue","d":"An EventEmitter that emits a change event when a task is either","k":"queue eventemitter emits change event task","l":"/api-utility#queue"},{"t":"counters","d":"Provides access to internal task counters.","k":"counters provides access internal task counters","l":"/api-utility#counters"},{"t":"simd","d":"Get and set use of SIMD vector unit instructions. Requires libvips to have been compiled with liborc support.","k":"simd simd vector unit instructions requires libvips compiled liborc support","l":"/api-utility#simd"}]
\ No newline at end of file
diff --git a/lib/constructor.js b/lib/constructor.js
index becc49b9..547fdef9 100644
--- a/lib/constructor.js
+++ b/lib/constructor.js
@@ -155,6 +155,13 @@ const Sharp = function (input, options) {
     extendRight: 0,
     extendBackground: [0, 0, 0, 255],
     withoutEnlargement: false,
+    affineMatrix: [],
+    affineBackground: [0, 0, 0, 255],
+    affineIdx: 0,
+    affineIdy: 0,
+    affineOdx: 0,
+    affineOdy: 0,
+    affineInterpolator: this.constructor.interpolators.bilinear,
     kernel: 'lanczos3',
     fastShrinkOnLoad: true,
     // operations
diff --git a/lib/operation.js b/lib/operation.js
index 43adc44e..1075c7f5 100644
--- a/lib/operation.js
+++ b/lib/operation.js
@@ -1,5 +1,6 @@
 'use strict';
 
+const { flatten: flattenArray } = require('array-flatten');
 const color = require('color');
 const is = require('./is');
 
@@ -82,6 +83,103 @@ function flop (flop) {
   return this;
 }
 
+/**
+ * Perform an affine transform on an image. This operation will always occur after resizing, extraction and rotation, if any.
+ *
+ * You must provide an array of length 4 or a 2x2 affine transformation matrix.
+ * By default, new pixels are filled with a black background. You can provide a background color with the `background` option.
+ * A particular interpolator may also be specified. Set the `interpolator` option to an attribute of the `sharp.interpolator` Object e.g. `sharp.interpolator.nohalo`.
+ *
+ * In the case of a 2x2 matrix, the transform is:
+ * - X = `matrix[0, 0]` \* (x + `idx`) + `matrix[0, 1]` \* (y + `idy`) + `odx`
+ * - Y = `matrix[1, 0]` \* (x + `idx`) + `matrix[1, 1]` \* (y + `idy`) + `ody`
+ *
+ * where:
+ * - x and y are the coordinates in input image.
+ * - X and Y are the coordinates in output image.
+ * - (0,0) is the upper left corner.
+ *
+ * @since 0.27.0
+ *
+ * @example
+ * const pipeline = sharp()
+ *   .affine([[1, 0.3], [0.1, 0.7]], {
+ *      background: 'white',
+ *      interpolate: sharp.interpolators.nohalo
+ *   })
+ *   .toBuffer((err, outputBuffer, info) => {
+ *      // outputBuffer contains the transformed image
+ *      // info.width and info.height contain the new dimensions
+ *   });
+ *
+ * inputStream
+ *   .pipe(pipeline);
+ *
+ * @param {Array<Array<number>>|Array<number>} matrix - affine transformation matrix
+ * @param {Object} [options] - if present, is an Object with optional attributes.
+ * @param {String|Object} [options.background="#000000"] - parsed by the [color](https://www.npmjs.org/package/color) module to extract values for red, green, blue and alpha.
+ * @param {Number} [options.idx=0] - input horizontal offset
+ * @param {Number} [options.idy=0] - input vertical offset
+ * @param {Number} [options.odx=0] - output horizontal offset
+ * @param {Number} [options.ody=0] - output vertical offset
+ * @param {String} [options.interpolator=sharp.interpolators.bicubic] - interpolator
+ * @returns {Sharp}
+ * @throws {Error} Invalid parameters
+ */
+function affine (matrix, options) {
+  const flatMatrix = flattenArray(matrix);
+  if (flatMatrix.length === 4 && flatMatrix.every(is.number)) {
+    this.options.affineMatrix = flatMatrix;
+  } else {
+    throw is.invalidParameterError('matrix', '1x4 or 2x2 array', matrix);
+  }
+
+  if (is.defined(options)) {
+    if (is.object(options)) {
+      this._setBackgroundColourOption('affineBackground', options.background);
+      if (is.defined(options.idx)) {
+        if (is.number(options.idx)) {
+          this.options.affineIdx = options.idx;
+        } else {
+          throw is.invalidParameterError('options.idx', 'number', options.idx);
+        }
+      }
+      if (is.defined(options.idy)) {
+        if (is.number(options.idy)) {
+          this.options.affineIdy = options.idy;
+        } else {
+          throw is.invalidParameterError('options.idy', 'number', options.idy);
+        }
+      }
+      if (is.defined(options.odx)) {
+        if (is.number(options.odx)) {
+          this.options.affineOdx = options.odx;
+        } else {
+          throw is.invalidParameterError('options.odx', 'number', options.odx);
+        }
+      }
+      if (is.defined(options.ody)) {
+        if (is.number(options.ody)) {
+          this.options.affineOdy = options.ody;
+        } else {
+          throw is.invalidParameterError('options.ody', 'number', options.ody);
+        }
+      }
+      if (is.defined(options.interpolator)) {
+        if (is.inArray(options.interpolator, Object.values(this.constructor.interpolators))) {
+          this.options.affineInterpolator = options.interpolator;
+        } else {
+          throw is.invalidParameterError('options.interpolator', 'valid interpolator name', options.interpolator);
+        }
+      }
+    } else {
+      throw is.invalidParameterError('options', 'object', options);
+    }
+  }
+
+  return this;
+}
+
 /**
  * Sharpen the image.
  * When used without parameters, performs a fast, mild sharpen of the output image.
@@ -482,6 +580,7 @@ module.exports = function (Sharp) {
     rotate,
     flip,
     flop,
+    affine,
     sharpen,
     median,
     blur,
diff --git a/lib/utility.js b/lib/utility.js
index f7232f89..1da7ae9b 100644
--- a/lib/utility.js
+++ b/lib/utility.js
@@ -13,6 +13,26 @@ const sharp = require('../build/Release/sharp.node');
  */
 const format = sharp.format();
 
+/**
+ * An Object containing the available interpolators and their proper values
+ * @readonly
+ * @enum {string}
+ */
+const interpolators = {
+  /** [Nearest neighbour interpolation](http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation). Suitable for image enlargement only. */
+  nearest: 'nearest',
+  /** [Bilinear interpolation](http://en.wikipedia.org/wiki/Bilinear_interpolation). Faster than bicubic but with less smooth results. */
+  bilinear: 'bilinear',
+  /** [Bicubic interpolation](http://en.wikipedia.org/wiki/Bicubic_interpolation) (the default). */
+  bicubic: 'bicubic',
+  /** [LBB interpolation](https://github.com/jcupitt/libvips/blob/master/libvips/resample/lbb.cpp#L100). Prevents some "[acutance](http://en.wikipedia.org/wiki/Acutance)" but typically reduces performance by a factor of 2. */
+  locallyBoundedBicubic: 'lbb',
+  /** [Nohalo interpolation](http://eprints.soton.ac.uk/268086/). Prevents acutance but typically reduces performance by a factor of 3. */
+  nohalo: 'nohalo',
+  /** [VSQBS interpolation](https://github.com/jcupitt/libvips/blob/master/libvips/resample/vsqbs.cpp#L48). Prevents "staircasing" when enlarging. */
+  vertexSplitQuadraticBasisSpline: 'vsqbs'
+};
+
 /**
  * An Object containing the version numbers of libvips and its dependencies.
  * @member
@@ -146,6 +166,7 @@ module.exports = function (Sharp) {
     Sharp[f.name] = f;
   });
   Sharp.format = format;
+  Sharp.interpolators = interpolators;
   Sharp.versions = versions;
   Sharp.queue = queue;
 };
diff --git a/package.json b/package.json
index f612ee21..03bdf614 100644
--- a/package.json
+++ b/package.json
@@ -69,7 +69,8 @@
     "Edward Silverton <e.silverton@gmail.com>",
     "Roman Malieiev <aromaleev@gmail.com>",
     "Tomas Szabo <tomas.szabo@deftomat.com>",
-    "Robert O'Rourke <robert@o-rourke.org>"
+    "Robert O'Rourke <robert@o-rourke.org>",
+    "Guillermo Alfonso Varela Chouciño <guillevch@gmail.com>"
   ],
   "scripts": {
     "install": "(node install/libvips && node install/dll-copy && prebuild-install) || (node-gyp rebuild && node install/dll-copy)",
@@ -112,6 +113,7 @@
     "vips"
   ],
   "dependencies": {
+    "array-flatten": "^3.0.0",
     "color": "^3.1.2",
     "detect-libc": "^1.0.3",
     "node-addon-api": "^3.0.2",
diff --git a/src/common.cc b/src/common.cc
index 13fc80f4..5da9d400 100644
--- a/src/common.cc
+++ b/src/common.cc
@@ -54,13 +54,13 @@ namespace sharp {
   bool AttrAsBool(Napi::Object obj, std::string attr) {
     return obj.Get(attr).As<Napi::Boolean>().Value();
   }
-  std::vector<double> AttrAsRgba(Napi::Object obj, std::string attr) {
-    Napi::Array background = obj.Get(attr).As<Napi::Array>();
-    std::vector<double> rgba(background.Length());
-    for (unsigned int i = 0; i < background.Length(); i++) {
-      rgba[i] = AttrAsDouble(background, i);
+  std::vector<double> AttrAsVectorOfDouble(Napi::Object obj, std::string attr) {
+    Napi::Array napiArray = obj.Get(attr).As<Napi::Array>();
+    std::vector<double> vectorOfDouble(napiArray.Length());
+    for (unsigned int i = 0; i < napiArray.Length(); i++) {
+      vectorOfDouble[i] = AttrAsDouble(napiArray, i);
     }
-    return rgba;
+    return vectorOfDouble;
   }
   std::vector<int32_t> AttrAsInt32Vector(Napi::Object obj, std::string attr) {
     Napi::Array array = obj.Get(attr).As<Napi::Array>();
@@ -109,7 +109,7 @@ namespace sharp {
       descriptor->createChannels = AttrAsUint32(input, "createChannels");
       descriptor->createWidth = AttrAsUint32(input, "createWidth");
       descriptor->createHeight = AttrAsUint32(input, "createHeight");
-      descriptor->createBackground = AttrAsRgba(input, "createBackground");
+      descriptor->createBackground = AttrAsVectorOfDouble(input, "createBackground");
     }
     // Limit input images to a given number of pixels, where pixels = width * height
     descriptor->limitInputPixels = AttrAsUint32(input, "limitInputPixels");
diff --git a/src/common.h b/src/common.h
index 71ff1697..ffc54afc 100644
--- a/src/common.h
+++ b/src/common.h
@@ -92,7 +92,7 @@ namespace sharp {
   double AttrAsDouble(Napi::Object obj, std::string attr);
   double AttrAsDouble(Napi::Object obj, unsigned int const attr);
   bool AttrAsBool(Napi::Object obj, std::string attr);
-  std::vector<double> AttrAsRgba(Napi::Object obj, std::string attr);
+  std::vector<double> AttrAsVectorOfDouble(Napi::Object obj, std::string attr);
   std::vector<int32_t> AttrAsInt32Vector(Napi::Object obj, std::string attr);
 
   // Create an InputDescriptor instance from a Napi::Object describing an input image
diff --git a/src/pipeline.cc b/src/pipeline.cc
index b182d7bb..883ebbe2 100644
--- a/src/pipeline.cc
+++ b/src/pipeline.cc
@@ -485,6 +485,18 @@ class PipelineWorker : public Napi::AsyncWorker {
           baton->leftOffsetPost, baton->topOffsetPost, baton->widthPost, baton->heightPost);
       }
 
+      // Affine transform
+      if (baton->affineMatrix.size() > 0) {
+        std::vector<double> background;
+        std::tie(image, background) = sharp::ApplyAlpha(image, baton->affineBackground);
+        image = image.affine(baton->affineMatrix, VImage::option()->set("background", background)
+          ->set("idx", baton->affineIdx)
+          ->set("idy", baton->affineIdy)
+          ->set("odx", baton->affineOdx)
+          ->set("ody", baton->affineOdy)
+          ->set("interpolate", baton->affineInterpolator));
+      }
+
       // Extend edges
       if (baton->extendTop > 0 || baton->extendBottom > 0 || baton->extendLeft > 0 || baton->extendRight > 0) {
         std::vector<double> background;
@@ -1249,7 +1261,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   // Resize options
   baton->withoutEnlargement = sharp::AttrAsBool(options, "withoutEnlargement");
   baton->position = sharp::AttrAsInt32(options, "position");
-  baton->resizeBackground = sharp::AttrAsRgba(options, "resizeBackground");
+  baton->resizeBackground = sharp::AttrAsVectorOfDouble(options, "resizeBackground");
   baton->kernel = sharp::AttrAsStr(options, "kernel");
   baton->fastShrinkOnLoad = sharp::AttrAsBool(options, "fastShrinkOnLoad");
   // Join Channel Options
@@ -1262,7 +1274,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   }
   // Operators
   baton->flatten = sharp::AttrAsBool(options, "flatten");
-  baton->flattenBackground = sharp::AttrAsRgba(options, "flattenBackground");
+  baton->flattenBackground = sharp::AttrAsVectorOfDouble(options, "flattenBackground");
   baton->negate = sharp::AttrAsBool(options, "negate");
   baton->blurSigma = sharp::AttrAsDouble(options, "blurSigma");
   baton->brightness = sharp::AttrAsDouble(options, "brightness");
@@ -1284,7 +1296,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   baton->useExifOrientation = sharp::AttrAsBool(options, "useExifOrientation");
   baton->angle = sharp::AttrAsInt32(options, "angle");
   baton->rotationAngle = sharp::AttrAsDouble(options, "rotationAngle");
-  baton->rotationBackground = sharp::AttrAsRgba(options, "rotationBackground");
+  baton->rotationBackground = sharp::AttrAsVectorOfDouble(options, "rotationBackground");
   baton->rotateBeforePreExtract = sharp::AttrAsBool(options, "rotateBeforePreExtract");
   baton->flip = sharp::AttrAsBool(options, "flip");
   baton->flop = sharp::AttrAsBool(options, "flop");
@@ -1292,8 +1304,15 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   baton->extendBottom = sharp::AttrAsInt32(options, "extendBottom");
   baton->extendLeft = sharp::AttrAsInt32(options, "extendLeft");
   baton->extendRight = sharp::AttrAsInt32(options, "extendRight");
-  baton->extendBackground = sharp::AttrAsRgba(options, "extendBackground");
+  baton->extendBackground = sharp::AttrAsVectorOfDouble(options, "extendBackground");
   baton->extractChannel = sharp::AttrAsInt32(options, "extractChannel");
+  baton->affineMatrix = sharp::AttrAsVectorOfDouble(options, "affineMatrix");
+  baton->affineBackground = sharp::AttrAsVectorOfDouble(options, "affineBackground");
+  baton->affineIdx = sharp::AttrAsDouble(options, "affineIdx");
+  baton->affineIdy = sharp::AttrAsDouble(options, "affineIdy");
+  baton->affineOdx = sharp::AttrAsDouble(options, "affineOdx");
+  baton->affineOdy = sharp::AttrAsDouble(options, "affineOdy");
+  baton->affineInterpolator = vips::VInterpolate::new_from_name(sharp::AttrAsStr(options, "affineInterpolator").data());
 
   baton->removeAlpha = sharp::AttrAsBool(options, "removeAlpha");
   baton->ensureAlpha = sharp::AttrAsBool(options, "ensureAlpha");
@@ -1392,7 +1411,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   baton->tileSize = sharp::AttrAsUint32(options, "tileSize");
   baton->tileOverlap = sharp::AttrAsUint32(options, "tileOverlap");
   baton->tileAngle = sharp::AttrAsInt32(options, "tileAngle");
-  baton->tileBackground = sharp::AttrAsRgba(options, "tileBackground");
+  baton->tileBackground = sharp::AttrAsVectorOfDouble(options, "tileBackground");
   baton->tileSkipBlanks = sharp::AttrAsInt32(options, "tileSkipBlanks");
   baton->tileContainer = static_cast<VipsForeignDzContainer>(
     vips_enum_from_nick(nullptr, VIPS_TYPE_FOREIGN_DZ_CONTAINER,
diff --git a/src/pipeline.h b/src/pipeline.h
index f4ebf6f1..bc6fe5c7 100644
--- a/src/pipeline.h
+++ b/src/pipeline.h
@@ -119,6 +119,13 @@ struct PipelineBaton {
   int extendRight;
   std::vector<double> extendBackground;
   bool withoutEnlargement;
+  std::vector<double> affineMatrix;
+  std::vector<double> affineBackground;
+  double affineIdx;
+  double affineIdy;
+  double affineOdx;
+  double affineOdy;
+  vips::VInterpolate affineInterpolator;
   int jpegQuality;
   bool jpegProgressive;
   std::string jpegChromaSubsampling;
@@ -231,6 +238,13 @@ struct PipelineBaton {
     extendRight(0),
     extendBackground{ 0.0, 0.0, 0.0, 255.0 },
     withoutEnlargement(false),
+    affineMatrix{ 1.0, 0.0, 0.0, 1.0 },
+    affineBackground{ 0.0, 0.0, 0.0, 255.0 },
+    affineIdx(0),
+    affineIdy(0),
+    affineOdx(0),
+    affineOdy(0),
+    affineInterpolator(vips::VInterpolate::new_from_name("bicubic")),
     jpegQuality(80),
     jpegProgressive(false),
     jpegChromaSubsampling("4:2:0"),
diff --git a/test/fixtures/expected/affine-background-all-offsets-expected.jpg b/test/fixtures/expected/affine-background-all-offsets-expected.jpg
new file mode 100644
index 00000000..6a0efb2a
Binary files /dev/null and b/test/fixtures/expected/affine-background-all-offsets-expected.jpg differ
diff --git a/test/fixtures/expected/affine-background-expected.jpg b/test/fixtures/expected/affine-background-expected.jpg
new file mode 100644
index 00000000..cbce2cb1
Binary files /dev/null and b/test/fixtures/expected/affine-background-expected.jpg differ
diff --git a/test/fixtures/expected/affine-background-output-offsets-expected.jpg b/test/fixtures/expected/affine-background-output-offsets-expected.jpg
new file mode 100644
index 00000000..89789c9a
Binary files /dev/null and b/test/fixtures/expected/affine-background-output-offsets-expected.jpg differ
diff --git a/test/fixtures/expected/affine-bicubic-2x-upscale-expected.jpg b/test/fixtures/expected/affine-bicubic-2x-upscale-expected.jpg
new file mode 100644
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diff --git a/test/unit/affine.js b/test/unit/affine.js
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+++ b/test/unit/affine.js
@@ -0,0 +1,175 @@
+'use strict';
+
+const assert = require('assert');
+
+const sharp = require('../../');
+const fixtures = require('../fixtures');
+
+describe('Affine transform', () => {
+  describe('Invalid input', () => {
+    it('Missing matrix', () => {
+      assert.throws(() => {
+        sharp(fixtures.inputJpg)
+          .affine();
+      });
+    });
+    it('Invalid 1d matrix', () => {
+      assert.throws(() => {
+        sharp(fixtures.inputJpg)
+          .affine(['123', 123, 123, 123]);
+      });
+    });
+    it('Invalid 2d matrix', () => {
+      assert.throws(() => {
+        sharp(fixtures.inputJpg)
+          .affine([[123, 123], [null, 123]]);
+      });
+    });
+    it('Invalid options parameter type', () => {
+      assert.throws(() => {
+        sharp(fixtures.inputJpg)
+          .affine([[1, 0], [0, 1]], 'invalid options type');
+      });
+    });
+    it('Invalid background color', () => {
+      assert.throws(() => {
+        sharp(fixtures.inputJpg)
+          .affine([4, 4, 4, 4], { background: 'not a color' });
+      });
+    });
+    it('Invalid idx offset type', () => {
+      assert.throws(() => {
+        sharp(fixtures.inputJpg)
+          .affine([[4, 4], [4, 4]], { idx: 'invalid idx type' });
+      });
+    });
+    it('Invalid idy offset type', () => {
+      assert.throws(() => {
+        sharp(fixtures.inputJpg)
+          .affine([4, 4, 4, 4], { idy: 'invalid idy type' });
+      });
+    });
+    it('Invalid odx offset type', () => {
+      assert.throws(() => {
+        sharp(fixtures.inputJpg)
+          .affine([[4, 4], [4, 4]], { odx: 'invalid odx type' });
+      });
+    });
+    it('Invalid ody offset type', () => {
+      assert.throws(() => {
+        sharp(fixtures.inputJpg)
+          .affine([[4, 4], [4, 4]], { ody: 'invalid ody type' });
+      });
+    });
+    it('Invalid interpolator', () => {
+      assert.throws(() => {
+        sharp(fixtures.inputJpg)
+          .affine([[4, 4], [4, 4]], { interpolator: 'cubic' });
+      });
+    });
+  });
+  it('Applies identity matrix', done => {
+    const input = fixtures.inputJpg;
+    sharp(input)
+      .affine([[1, 0], [0, 1]])
+      .toBuffer((err, data) => {
+        if (err) throw err;
+        fixtures.assertSimilar(input, data, done);
+      });
+  });
+  it('Applies resize affine matrix', done => {
+    const input = fixtures.inputJpg;
+    const inputWidth = 2725;
+    const inputHeight = 2225;
+    sharp(input)
+      .affine([[0.2, 0], [0, 1.5]])
+      .toBuffer((err, data, info) => {
+        if (err) throw err;
+        fixtures.assertSimilar(input, data, done);
+        assert.strictEqual(info.width, Math.ceil(inputWidth * 0.2));
+        assert.strictEqual(info.height, Math.ceil(inputHeight * 1.5));
+      });
+  });
+  it('Resizes and applies affine transform', done => {
+    const input = fixtures.inputJpg;
+    sharp(input)
+      .resize(500, 500)
+      .affine([[0.5, 1], [1, 0.5]])
+      .toBuffer((err, data) => {
+        if (err) throw err;
+        fixtures.assertSimilar(data, fixtures.expected('affine-resize-expected.jpg'), done);
+      });
+  });
+  it('Extracts and applies affine transform', done => {
+    sharp(fixtures.inputJpg)
+      .extract({ left: 300, top: 300, width: 600, height: 600 })
+      .affine([0.3, 0, -0.5, 0.3])
+      .toBuffer((err, data) => {
+        if (err) throw err;
+        fixtures.assertSimilar(data, fixtures.expected('affine-extract-expected.jpg'), done);
+      });
+  });
+  it('Rotates and applies affine transform', done => {
+    sharp(fixtures.inputJpg320x240)
+      .rotate(90)
+      .affine([[-1.2, 0], [0, -1.2]])
+      .toBuffer((err, data) => {
+        if (err) throw err;
+        fixtures.assertSimilar(data, fixtures.expected('affine-rotate-expected.jpg'), done);
+      });
+  });
+  it('Extracts, rotates and applies affine transform', done => {
+    sharp(fixtures.inputJpg)
+      .extract({ left: 1000, top: 1000, width: 200, height: 200 })
+      .rotate(45, { background: 'blue' })
+      .affine([[2, 1], [2, -0.5]], { background: 'red' })
+      .toBuffer((err, data) => {
+        if (err) throw err;
+        fixtures.assertSimilar(fixtures.expected('affine-extract-rotate-expected.jpg'), data, done);
+      });
+  });
+  it('Applies affine transform with background color', done => {
+    sharp(fixtures.inputJpg320x240)
+      .rotate(180)
+      .affine([[-1.5, 1.2], [-1, 1]], { background: 'red' })
+      .toBuffer((err, data) => {
+        if (err) throw err;
+        fixtures.assertSimilar(fixtures.expected('affine-background-expected.jpg'), data, done);
+      });
+  });
+  it('Applies affine transform with background color and output offsets', done => {
+    sharp(fixtures.inputJpg320x240)
+      .rotate(180)
+      .affine([[-2, 1.5], [-1, 2]], { background: 'blue', odx: 40, ody: -100 })
+      .toBuffer((err, data) => {
+        if (err) throw err;
+        fixtures.assertSimilar(fixtures.expected('affine-background-output-offsets-expected.jpg'), data, done);
+      });
+  });
+  it('Applies affine transform with background color and all offsets', done => {
+    sharp(fixtures.inputJpg320x240)
+      .rotate(180)
+      .affine([[-1.2, 1.8], [-1, 2]], { background: 'yellow', idx: 10, idy: -40, odx: 10, ody: -50 })
+      .toBuffer((err, data) => {
+        if (err) throw err;
+        fixtures.assertSimilar(fixtures.expected('affine-background-all-offsets-expected.jpg'), data, done);
+      });
+  });
+  describe('Interpolations', () => {
+    const input = fixtures.inputJpg320x240;
+    const inputWidth = 320;
+    const inputHeight = 240;
+    for (const interp in sharp.interpolators) {
+      it(`Performs 2x upscale with ${interp} interpolation`, done => {
+        sharp(input)
+          .affine([[2, 0], [0, 2]], { interpolator: sharp.interpolators[interp] })
+          .toBuffer((err, data, info) => {
+            if (err) throw err;
+            assert.strictEqual(info.width, Math.ceil(inputWidth * 2));
+            assert.strictEqual(info.height, Math.ceil(inputHeight * 2));
+            fixtures.assertSimilar(fixtures.expected(`affine-${sharp.interpolators[interp]}-2x-upscale-expected.jpg`), data, done);
+          });
+      });
+    }
+  });
+});