Add cyan and red color options, rename pink to magenta.

README.md

@@ -39,7 +39,7 @@ imgDiff(
     similarity: 0.01, // 1.0 - 0.01
     blend: 1.0,       // 1.0 - 0.0
     opacity: 0.1,     // 1.0 - 0.0
-    color: 'pink'     // pink, yellow, green, blue or ''
+    color: 'magenta'  // magenta, yellow, cyan, red green, blue or ''
   }
 ).then((ssim) => {
   console.log(ssim)
@@ -77,8 +77,8 @@ Higher values result in a more opaque background image.
 ### color
 The color balance of the differential pixels.  
 An empty string displays the default differential pixels.  
-*Set:* `['pink', 'yellow', 'green', 'blue', '']`  
-*Default:* `'pink'`
+*Set:* `['magenta', 'yellow', 'cyan', 'red', 'green', 'blue', '']`  
+*Default:* `'magenta'`
 
 ## Samples
 

index.js

@@ -64,7 +64,7 @@ module.exports = function (refImg, cmpImg, outImg, opts) {
     similarity: 0.01, // 1.0 - 0.01
     blend: 1.0,       // 1.0 - 0.0
     opacity: 0.1,     // 1.0 - 0.0
-    color: 'pink'     // pink, yellow, green, blue, '', or FFmpeg colorbalance
+    color: 'magenta'  // magenta, yellow, cyan, red green, blue or ''
   }
   if (opts) Object.assign(options, opts)
   const ssim = options.ssim
@@ -74,12 +74,18 @@ module.exports = function (refImg, cmpImg, outImg, opts) {
     `:similarity=${options.similarity}:blend=${options.blend}`
   let colorbalance = 'colorbalance='
   switch (options.color) {
-    case 'pink':
+    case 'magenta':
       colorbalance += `rs=1:gs=-1:bs=1:rm=1:gm=-1:bm=1:rh=1:gh=-1:bh=1`
       break
     case 'yellow':
       colorbalance += `rs=1:gs=1:bs=-1:rm=1:gm=1:bm=-1:rh=1:gh=1:bh=-1`
       break
+    case 'cyan':
+      colorbalance += `rs=-1:gs=1:bs=1:rm=-1:gm=1:bm=1:rh=-1:gh=1:bh=1`
+      break
+    case 'red':
+      colorbalance += `rs=1:gs=-1:bs=-1:rm=1:gm=-1:bm=-1:rh=1:gh=-1:bh=-1`
+      break
     case 'green':
       colorbalance += `rs=-1:gs=1:bs=-1:rm=-1:gm=1:bm=-1:rh=-1:gh=1:bh=-1`
       break

test/run.js

@@ -29,8 +29,10 @@ function test (outImg, options) {
 }
 
 test() // SSIM only
-  .then(() => test('out.png')) // Default options (color: 'pink')
+  .then(() => test('out.png')) // Default options (color: 'magenta')
   .then(() => test('out-color-yellow.png', {color: 'yellow'}))
+  .then(() => test('out-color-cyan.png', {color: 'cyan'}))
+  .then(() => test('out-color-red.png', {color: 'red'}))
   .then(() => test('out-color-green.png', {color: 'green'}))
   .then(() => test('out-color-blue.png', {color: 'blue'}))
   .then(() => test('out-color-empty.png', {color: ''}))