2 * Pixastic Lib - Sepia filter - v0.1.0
3 * Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
4 * MIT License [http://www.opensource.org/licenses/mit-license.php]
7 Pixastic.Actions.sepia = {
9 process : function(params) {
10 var mode = (parseInt(params.options.mode,10)||0);
11 if (mode < 0) mode = 0;
12 if (mode > 1) mode = 1;
14 if (Pixastic.Client.hasCanvasImageData()) {
15 var data = Pixastic.prepareData(params);
16 var rect = params.options.rect;
22 var offsetY = (y-1)*w4;
25 var offset = offsetY + (x-1)*4;
28 // a bit faster, but not as good
29 var d = data[offset] * 0.299 + data[offset+1] * 0.587 + data[offset+2] * 0.114;
35 var or = data[offset];
36 var og = data[offset+1];
37 var ob = data[offset+2];
39 var r = (or * 0.393 + og * 0.769 + ob * 0.189);
40 var g = (or * 0.349 + og * 0.686 + ob * 0.168);
41 var b = (or * 0.272 + og * 0.534 + ob * 0.131);
44 if (r < 0) r = 0; if (r > 255) r = 255;
45 if (g < 0) g = 0; if (g > 255) g = 255;
46 if (b < 0) b = 0; if (b > 255) b = 255;
57 checkSupport : function() {
58 return Pixastic.Client.hasCanvasImageData();