Make colorCount arg optional in getPalette function.

README.markdown

@@ -17,14 +17,14 @@ getColor(sourceImage[, quality])
 returns {r: num, g: num, b: num}
 ```
 
-###Build a color palette from an image
+###Build a 8 color palette from an image
 ```js
 var colorThief = new ColorThief();
-colorThief.getPalette(sourceImage);
+colorThief.getPalette(sourceImage, 8);
 ```
 
 ```js
-getPalette(sourceImage, colorCount[, quality])
+getPalette(sourceImage[, colorCount, quality])
 returns [ [num, num, num], [num, num, num], ... ]
 ```
 

demo.js

@@ -30,8 +30,6 @@ $(document).ready(function () {
 
   var colorThief = new ColorThief();
 
-  var PALETTE_COLOR_COUNT = 10;
-
   // Run Color Thief functions and display results below image.
   // We also log execution time of functions for display.
   var showColorsForImage = function($image, $imageSection ) {
@@ -39,7 +37,7 @@ $(document).ready(function () {
     var start                    = Date.now();
     var color                    = colorThief.getColor(image);
     var elapsedTimeForGetColor   = Date.now() - start;
-    var palette                  = colorThief.getPalette(image, PALETTE_COLOR_COUNT);
+    var palette                  = colorThief.getPalette(image);
     var elapsedTimeForGetPalette = Date.now() - start + elapsedTimeForGetColor;
 
     var colorThiefOutput = {

js/color-thief.js

@@ -78,22 +78,31 @@ ColorThief.prototype.getColor = function(sourceImage, quality) {
 
 
 /*
- * getPalette(sourceImage, colorCount[, quality])
+ * getPalette(sourceImage[, colorCount, quality])
  * returns array[ {r: num, g: num, b: num}, {r: num, g: num, b: num}, ...]
  *
  * Use the median cut algorithm provided by quantize.js to cluster similar colors.
  *
- * Quality is an optional argument. It needs to be an integer. 0 is the highest quality settings.
+ * colorCount determines the size of the palette; the number of colors returned. If not set, it
+ * defaults to 10.
+ *
+ * BUGGY: Function does not always return the requested amount of colors. It can be +/- 2.
+ *
+ * quality is an optional argument. It needs to be an integer. 0 is the highest quality settings.
  * 10 is the default. There is a trade-off between quality and speed. The bigger the number, the
  * faster the palette generation but the greater the likelihood that colors will be missed.
  *
- * BUGGY: Function does not always return the requested amount of colors. It can be +/- 2.
+ *
  */
 ColorThief.prototype.getPalette = function(sourceImage, colorCount, quality) {
 
+    if (typeof colorCount === 'undefined') {
+        colorCount = 10;
+    };
     if (typeof quality === 'undefined') {
         quality = 10;
     };
+
     // Create custom CanvasImage object
     var image      = new CanvasImage(sourceImage);
     var imageData  = image.getImageData();