2 * Pixastic Lib - Remove noise - 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.removenoise = {
8 process : function(params) {
10 if (Pixastic.Client.hasCanvasImageData()) {
11 var data = Pixastic.prepareData(params);
13 var rect = params.options.rect;
20 var offsetY = (y-1)*w4;
22 var nextY = (y == h) ? y - 1 : y;
23 var prevY = (y == 1) ? 0 : y-2;
25 var offsetYPrev = prevY*w*4;
26 var offsetYNext = nextY*w*4;
30 var offset = offsetY + (x*4-4);
32 var offsetPrev = offsetYPrev + ((x == 1) ? 0 : x-2) * 4;
33 var offsetNext = offsetYNext + ((x == w) ? x-1 : x) * 4;
35 var minR, maxR, minG, maxG, minB, maxB;
37 minR = maxR = data[offsetPrev];
38 var r1 = data[offset-4], r2 = data[offset+4], r3 = data[offsetNext];
39 if (r1 < minR) minR = r1;
40 if (r2 < minR) minR = r2;
41 if (r3 < minR) minR = r3;
42 if (r1 > maxR) maxR = r1;
43 if (r2 > maxR) maxR = r2;
44 if (r3 > maxR) maxR = r3;
46 minG = maxG = data[offsetPrev+1];
47 var g1 = data[offset-3], g2 = data[offset+5], g3 = data[offsetNext+1];
48 if (g1 < minG) minG = g1;
49 if (g2 < minG) minG = g2;
50 if (g3 < minG) minG = g3;
51 if (g1 > maxG) maxG = g1;
52 if (g2 > maxG) maxG = g2;
53 if (g3 > maxG) maxG = g3;
55 minB = maxB = data[offsetPrev+2];
56 var b1 = data[offset-2], b2 = data[offset+6], b3 = data[offsetNext+2];
57 if (b1 < minB) minB = b1;
58 if (b2 < minB) minB = b2;
59 if (b3 < minB) minB = b3;
60 if (b1 > maxB) maxB = b1;
61 if (b2 > maxB) maxB = b2;
62 if (b3 > maxB) maxB = b3;
64 if (data[offset] > maxR) {
66 } else if (data[offset] < minR) {
69 if (data[offset+1] > maxG) {
70 data[offset+1] = maxG;
71 } else if (data[offset+1] < minG) {
72 data[offset+1] = minG;
74 if (data[offset+2] > maxB) {
75 data[offset+2] = maxB;
76 } else if (data[offset+2] < minB) {
77 data[offset+2] = minB;
86 checkSupport : function() {
87 return Pixastic.Client.hasCanvasImageData();