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All of jfsiii awesome edits are now in place.
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Lokesh Dhakar
@@ -3,7 +3,7 @@
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* by Lokesh Dhakar - http://www.lokeshdhakar.com
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*
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* Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
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*
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*
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* The median cut palette function uses quantize.js which is written by Nick Rabinowitz
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* and licensed under the MIT license. Big props to Nick as this is where the magic happens.
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*
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@@ -16,49 +16,49 @@
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* createAreaBasedPalette()
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*
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* Requires jquery and quantize.js.
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*/
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*/
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/*
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CanvasImage Class
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Class that wraps the html image element and canvas.
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It also simplifies some of the canvas context manipulation
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with a set of helper functions.
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CanvasImage Class
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Class that wraps the html image element and canvas.
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It also simplifies some of the canvas context manipulation
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with a set of helper functions.
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*/
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var CanvasImage = function(image){
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// If jquery object is passed in, get html element
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this.imgEl = (image.jquery)? image[0]: image;
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var CanvasImage = function (image) {
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// If jquery object is passed in, get html element
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this.imgEl = (image.jquery) ? image[0] : image;
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this.canvas = document.createElement('canvas'),
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this.canvas = document.createElement('canvas');
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this.context = this.canvas.getContext('2d');
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document.body.appendChild(this.canvas);
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document.body.appendChild(this.canvas);
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this.width = this.canvas.width = $(this.imgEl).width(),
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this.height = this.canvas.height = $(this.imgEl).height();
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this.width = this.canvas.width = $(this.imgEl).width();
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this.height = this.canvas.height = $(this.imgEl).height();
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this.context.drawImage(this.imgEl, 0, 0);
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}
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this.context.drawImage(this.imgEl, 0, 0);
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};
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CanvasImage.prototype.clear = function() {
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this.context.clearRect(0, 0, this.width, this.height);
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}
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CanvasImage.prototype.clear = function () {
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this.context.clearRect(0, 0, this.width, this.height);
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};
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CanvasImage.prototype.update = function(imageData) {
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this.context.putImageData(imageData, 0, 0);
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}
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CanvasImage.prototype.update = function (imageData) {
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this.context.putImageData(imageData, 0, 0);
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};
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CanvasImage.prototype.getPixelCount = function() {
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return this.width * this.height;
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}
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CanvasImage.prototype.getPixelCount = function () {
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return this.width * this.height;
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};
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CanvasImage.prototype.getImageData = function() {
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return this.context.getImageData(0, 0, this.width, this.height);
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}
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CanvasImage.prototype.getImageData = function () {
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return this.context.getImageData(0, 0, this.width, this.height);
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};
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CanvasImage.prototype.removeCanvas = function() {
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$(this.canvas).remove();
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}
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CanvasImage.prototype.removeCanvas = function () {
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$(this.canvas).remove();
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};
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/*
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@@ -67,41 +67,16 @@ CanvasImage.prototype.removeCanvas = function() {
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*
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* Use the median cut algorithm provided by quantize.js to cluster similar
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* colors and return the base color from the largest cluster.
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*/
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function getDominantColor(sourceImage){
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*/
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function getDominantColor(sourceImage) {
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var palette = [];
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var palette = createPalette(sourceImage, 5);
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var dominant = palette[0];
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// Create custom CanvasImage object
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var image = new CanvasImage(sourceImage),
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imageData = image.getImageData(),
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pixels = imageData.data,
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pixelCount = image.getPixelCount();
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// Store the RGB values in an array format suitable for quantize function
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var pixelArray = [];
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for (var i = 0; i < pixelCount; i++) {
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// If pixel is mostly opaque and not white
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if(pixels[i*4+3] >= 125){
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if(!(pixels[i*4] > 250 && pixels[i*4+1] > 250 && pixels[i*4+2] > 250)){
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pixelArray.push( [pixels[i*4], pixels[i*4+1], pixels[i*4+2]]);
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}
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}
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};
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// Send array to quantize function which clusters values
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// using median cut algorithm
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var cmap = MMCQ.quantize(pixelArray, 5);
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var newPalette = cmap.palette();
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// Clean up
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image.removeCanvas();
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return {r: newPalette[0][0], g: newPalette[0][1], b: newPalette[0][2]};
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return dominant;
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}
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/*
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* createPalette(sourceImage, colorCount)
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* returns array[ {r: num, g: num, b: num}, {r: num, g: num, b: num}, ...]
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@@ -110,37 +85,41 @@ function getDominantColor(sourceImage){
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* colors.
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*
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* BUGGY: Function does not always return the requested amount of colors. It can be +/- 2.
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*/
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function createPalette(sourceImage, colorCount){
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*/
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function createPalette(sourceImage, colorCount) {
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var palette = [];
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// Create custom CanvasImage object
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var image = new CanvasImage(sourceImage),
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imageData = image.getImageData(),
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pixels = imageData.data,
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pixelCount = image.getPixelCount();
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// Create custom CanvasImage object
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var image = new CanvasImage(sourceImage),
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imageData = image.getImageData(),
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pixels = imageData.data,
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pixelCount = image.getPixelCount();
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// Store the RGB values in an array format suitable for quantize function
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var pixelArray = [];
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for (var i = 0; i < pixelCount; i++) {
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// If pixel is mostly opaque and not white
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if(pixels[i*4+3] >= 125){
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if(!(pixels[i*4] > 250 && pixels[i*4+1] > 250 && pixels[i*4+2] > 250)){
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pixelArray.push( [pixels[i*4], pixels[i*4+1], pixels[i*4+2]]);
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}
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}
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};
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// Store the RGB values in an array format suitable for quantize function
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var pixelArray = [];
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for (var i = 0, offset, r, g, b, a; i < pixelCount; i++) {
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offset = i * 4;
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r = pixels[offset + 0];
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g = pixels[offset + 1];
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b = pixels[offset + 2];
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a = pixels[offset + 3];
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// If pixel is mostly opaque and not white
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if (a >= 125) {
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if (!(r > 250 && g > 250 && b > 250)) {
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pixelArray.push([r, g, b]);
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}
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}
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}
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// Send array to quantize function which clusters values
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// using median cut algorithm
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var cmap = MMCQ.quantize(pixelArray, colorCount);
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var newPalette = cmap.palette();
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// Send array to quantize function which clusters values
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// using median cut algorithm
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// Clean up
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image.removeCanvas();
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var cmap = MMCQ.quantize(pixelArray, colorCount);
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var palette = cmap.palette();
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return newPalette;
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// Clean up
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image.removeCanvas();
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return palette;
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}
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@@ -151,40 +130,40 @@ function createPalette(sourceImage, colorCount){
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* Add up all pixels RGB values and return average.
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* Tends to return muddy gray/brown color. Most likely, you'll be better
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* off using getDominantColor() instead.
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*/
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*/
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function getAverageRGB(sourceImage) {
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// Config
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var sampleSize = 10;
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// Create custom CanvasImage object
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var image = new CanvasImage(sourceImage),
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imageData = image.getImageData(),
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pixels = imageData.data,
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pixelCount = image.getPixelCount();
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// Config
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var sampleSize = 10;
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// Reset vars
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var i = 0,
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count = 0,
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rgb = {r:0,g:0,b:0};
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// Create custom CanvasImage object
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var image = new CanvasImage(sourceImage),
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imageData = image.getImageData(),
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pixels = imageData.data,
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pixelCount = image.getPixelCount();
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// Loop through every # pixels. (# is set in Config above via the blockSize var)
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// Add all the red values together, repeat for blue and green.
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// Last step, divide by the number of pixels checked to get average.
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// Reset vars
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var i = 0,
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count = 0,
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rgb = {r:0, g:0, b:0};
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// Loop through every # pixels. (# is set in Config above via the blockSize var)
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// Add all the red values together, repeat for blue and green.
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// Last step, divide by the number of pixels checked to get average.
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while ( (i += sampleSize * 4) < pixelCount ) {
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// if pixel is mostly opaque
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if(pixels[i+3] > 125){
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++count;
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rgb.r += pixels[i];
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rgb.g += pixels[i+1];
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rgb.b += pixels[i+2];
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}
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// if pixel is mostly opaque
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if (pixels[i+3] > 125) {
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++count;
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rgb.r += pixels[i];
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rgb.g += pixels[i+1];
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rgb.b += pixels[i+2];
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}
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}
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rgb.r = Math.floor(rgb.r/count);
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rgb.g = Math.floor(rgb.g/count);
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rgb.b = Math.floor(rgb.b/count);
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rgb.r = ~~(rgb.r/count);
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rgb.g = ~~(rgb.g/count);
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rgb.b = ~~(rgb.b/count);
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return rgb;
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return rgb;
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}
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@@ -194,59 +173,55 @@ function getAverageRGB(sourceImage) {
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*
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* Break the image into sections. Loops through pixel RGBS in the section and average color.
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* Tends to return muddy gray/brown color. You're most likely better off using createPalette().
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*
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*
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* BUGGY: Function does not always return the requested amount of colors. It can be +/- 2.
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*
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*/
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function createAreaBasedPalette(sourceImage, colorCount){
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*
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*/
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function createAreaBasedPalette(sourceImage, colorCount) {
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var palette = [];
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var palette = [];
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// Create custom CanvasImage object
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var image = new CanvasImage(sourceImage),
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imageData = image.getImageData(),
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pixels = imageData.data,
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pixelCount = image.getPixelCount();
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// How big a pixel area does each palette color get
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var rowCount = colCount = Math.round(Math.sqrt(colorCount)),
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colWidth = Math.round(image.width / colCount),
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rowHeight = Math.round(image.height / rowCount);
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var count = offset = rowOffset = vertOffset = horizOffset = 0,
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rgb = {r:0,g:0,b:0};
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// Create custom CanvasImage object
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var image = new CanvasImage(sourceImage),
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imageData = image.getImageData(),
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pixels = imageData.data,
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pixelCount = image.getPixelCount();
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// Loop through pixels section by section.
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// At the end of each section, push the average rgb color to palette array.
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for(var i=0; i<rowCount; i++){
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vertOffset = i * rowHeight * image.width * 4;
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for(var j=0; j<colCount; j++){
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horizOffset = j * colWidth * 4;
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for( var k = 0; k < rowHeight; k++){
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rowOffset = k * image.width * 4;
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for( var l = 0; l < colWidth; l++){
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offset = vertOffset + horizOffset + rowOffset + (l * 4);
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rgb.r += pixels[offset];
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rgb.g += pixels[offset+1];
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rgb.b += pixels[offset+2];
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count++;
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}
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}
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rgb.r = Math.floor(rgb.r/count);
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rgb.g = Math.floor(rgb.g/count);
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rgb.b = Math.floor(rgb.b/count);
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palette.push(rgb);
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// reset before next section
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rgb = {r:0,g:0,b:0};
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count = 0;
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}
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}
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return palette;
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}
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// How big a pixel area does each palette color get
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var rowCount = Math.round(Math.sqrt(colorCount)),
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colCount = rowCount,
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colWidth = Math.round(image.width / colCount),
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rowHeight = Math.round(image.height / rowCount);
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// Loop through pixels section by section.
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// At the end of each section, push the average rgb color to palette array.
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for (var i = 0, vertOffset; i<rowCount; i++) {
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vertOffset = i * rowHeight * image.width * 4;
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for (var j = 0, horizOffset, rgb, count; j<colCount; j++) {
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horizOffset = j * colWidth * 4;
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rgb = {r:0, g:0, b:0};
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count = 0;
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for (var k = 0, rowOffset; k < rowHeight; k++) {
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rowOffset = k * image.width * 4;
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for (var l = 0, offset; l < colWidth; l++) {
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offset = vertOffset + horizOffset + rowOffset + (l * 4);
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rgb.r += pixels[offset];
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rgb.g += pixels[offset+1];
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rgb.b += pixels[offset+2];
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count++;
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}
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}
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rgb.r = ~~(rgb.r/count);
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rgb.g = ~~(rgb.g/count);
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rgb.b = ~~(rgb.b/count);
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palette.push(rgb);
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}
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}
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return palette;
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}
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