Merge pull request #437 from DanMMX/422

Adding hex colors wrapping

examples/compare.js

@@ -0,0 +1,15 @@
+var gm = require('../')
+  , dir = __dirname + '/imgs'
+  , imgs = 'bitdepth.png original.jpg'.split(' ').map(function (img) {
+      return dir + '/' + img
+    })
+  , out = dir + '/compare.jpg'
+
+gm.compare(imgs[0], imgs[1], { highlightColor: "#fff", file: out }, function (err) {
+  if (err) return console.dir(arguments)
+  console.log('The images are equal: %s', arguments[1]);
+  console.log('Actual equality: %d', arguments[2]);
+  console.log(this.outname + " created  ::  " + arguments[3]);
+  require('child_process').exec('open ' + out);
+});
+

lib/compare.js

@@ -30,6 +30,11 @@ module.exports = exports = function (proto) {
     var tolerance = 0.4;
     // outputting the diff image
     if (typeof options === 'object') {
+
+      if (options.highlightColor && options.highlightColor.indexOf('"') < 0) {
+        options.highlightColor = '"' + options.highlightColor + '"';
+      }
+
       if (options.file) {
         if (typeof options.file !== 'string') {
           throw new TypeError('The path for the diff output is invalid');

test/422.js

@@ -0,0 +1,39 @@
+var assert = require('assert');
+var fs = require('fs');
+
+module.exports = function (gm, dir, finish, GM) {
+  // Same image
+  GM.compare(dir + '/original.jpg', dir + '/original.png', function(err, same) {
+    if (err) return finish(err);
+    if (!same) return finish(new Error('Compare should be the same!'));
+
+    // Compare almost similar images for which ImageMagick
+    // returns a exponent-style floating point number
+    gm.compare(__dirname + '/fixtures/compare_1.png', __dirname + '/fixtures/compare_2.png', function(err, same, diff) {
+      if (err) return finish(err);
+
+      // Create a new noisy image
+      gm.noise(0.3).write(dir + '/noise3.png', function (err) {
+        if (err) return finish(err);
+        if (!same) return finish(new Error('Compare should be the same!'));
+
+        var options = {
+          highlightColor: '#fff',
+          highlightStyle: 'XOR',
+          file: dir + '/diff.png',
+          tolerance: 0.001
+        };
+
+        // Compare these images and write to a file.
+        GM.compare(dir + '/original.jpg', dir + '/noise3.png', options, function(err) {
+          if (err) return finish(err);
+
+          fs.exists(options.file, function(exists) {
+            if (exists) finish();
+            else finish(new Error('Diff file does not exist.'));
+          });
+        });
+      });
+    });
+  });
+};