Add support for profile-less CMYK images #99

index.js

@@ -1,5 +1,6 @@
 'use strict';
 
+var path = require('path');
 var util = require('util');
 var stream = require('stream');
 
@@ -17,6 +18,8 @@ var Sharp = function(input) {
     // input options
     streamIn: false,
     sequentialRead: false,
+    // ICC profile to use when input CMYK image has no embedded profile
+    iccProfileCmyk: path.join(__dirname, 'icc', 'USWebCoatedSWOP.icc'),
     // resize options
     topOffsetPre: -1,
     leftOffsetPre: -1,

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sharp",
-  "version": "0.7.1",
+  "version": "0.7.2",
   "author": "Lovell Fuller <npm@lovell.info>",
   "contributors": [
     "Pierre Inglebert <pierre.inglebert@gmail.com>",
@@ -41,9 +41,9 @@
     "stream"
   ],
   "dependencies": {
-    "bluebird": "^2.3.9",
+    "bluebird": "^2.3.10",
     "color": "^0.7.1",
-    "nan": "^1.3.0"
+    "nan": "^1.4.0"
   },
   "devDependencies": {
     "mocha": "^2.0.1",

src/resize.cc

@@ -30,6 +30,7 @@ struct ResizeBaton {
   std::string fileIn;
   void* bufferIn;
   size_t bufferInLength;
+  std::string iccProfileCmyk;
   std::string output;
   std::string outputFormat;
   void* bufferOut;
@@ -236,16 +237,28 @@ class ResizeWorker : public NanAsyncWorker {
     }
 
     // Handle colour profile, if any, for non sRGB images
-    if (image->Type != VIPS_INTERPRETATION_sRGB && vips_image_get_typeof(image, VIPS_META_ICC_NAME)) {
-      // Import embedded profile
+    if (image->Type != VIPS_INTERPRETATION_sRGB) {
+      // Get the input colour profile
+      if (vips_image_get_typeof(image, VIPS_META_ICC_NAME)) {
+        // Use embedded profile
         VipsImage *profile = vips_image_new();
         vips_object_local(hook, profile);
-      if (vips_icc_import(image, &profile, NULL, "embedded", TRUE, "pcs", VIPS_PCS_XYZ, NULL)) {
+        if (vips_icc_import(image, &profile, "pcs", VIPS_PCS_XYZ, "embedded", TRUE, NULL)) {
           return Error(baton, hook);
         }
         g_object_unref(image);
         image = profile;
-      // Convert to sRGB colour space
+      } else if (image->Type == VIPS_INTERPRETATION_CMYK) {
+        // CMYK with no embedded profile
+        VipsImage *profile = vips_image_new();
+        vips_object_local(hook, profile);
+        if (vips_icc_import(image, &profile, "pcs", VIPS_PCS_XYZ, "input_profile", (baton->iccProfileCmyk).c_str(), NULL)) {
+          return Error(baton, hook);
+        }
+        g_object_unref(image);
+        image = profile;
+      }
+      // Attempt to convert to sRGB colour space
       VipsImage *colourspaced = vips_image_new();
       vips_object_local(hook, colourspaced);
       if (vips_colourspace(image, &colourspaced, VIPS_INTERPRETATION_sRGB, NULL)) {
@@ -738,6 +751,8 @@ NAN_METHOD(resize) {
     baton->bufferInLength = node::Buffer::Length(buffer);
     baton->bufferIn = node::Buffer::Data(buffer);
   }
+  // ICC profile to use when input CMYK image has no embedded profile
+  baton->iccProfileCmyk = *String::Utf8Value(options->Get(NanNew<String>("iccProfileCmyk"))->ToString());
   // Extract image options
   baton->topOffsetPre = options->Get(NanNew<String>("topOffsetPre"))->Int32Value();
   baton->leftOffsetPre = options->Get(NanNew<String>("leftOffsetPre"))->Int32Value();

test/fixtures/index.js

@@ -13,6 +13,7 @@ module.exports = {
   inputJpgWithExifMirroring: getPath('Landscape_5.jpg'), // https://github.com/recurser/exif-orientation-examples/blob/master/Landscape_5.jpg
   inputJpgWithGammaHoliness: getPath('gamma_dalai_lama_gray.jpg'), // http://www.4p8.com/eric.brasseur/gamma.html
   inputJpgWithCmykProfile: getPath('Channel_digital_image_CMYK_color.jpg'), // http://en.wikipedia.org/wiki/File:Channel_digital_image_CMYK_color.jpg
+  inputJpgWithCmykNoProfile: getPath('Channel_digital_image_CMYK_color_no_profile.jpg'),
 
   inputPng: getPath('50020484-00001.png'), // http://c.searspartsdirect.com/lis_png/PLDM/50020484-00001.png
   inputPngWithTransparency: getPath('blackbug.png'), // public domain

test/unit/colourspace.js

@@ -66,4 +66,16 @@ describe('Colour space conversion', function() {
       });
   });
 
+  it('From profile-less CMYK to sRGB', function(done) {
+    sharp(fixtures.inputJpgWithCmykNoProfile)
+      .resize(320)
+      .toBuffer(function(err, data, info) {
+        if (err) throw err;
+        assert.strictEqual(true, data.length > 0);
+        assert.strictEqual('jpeg', info.format);
+        assert.strictEqual(320, info.width);
+        done();
+      });
+  });
+
 });