bmd = document.getElementById("canvas").bitmapData; for (var i = 0; i<100; i++) { for (var j = 0; j<300; j++) { var d = Math.pow(i-50, 2) + Math.pow(j-150, 2); var r = Math.sin(Math.sqrt(d) * 10 * Math.PI/180); var color = 100 + 100 * r << 16; bmd.setPixel( i, j, color ); } } bmd.copyChannel(bmd, bmd.rect, new Point(100, 0), BitmapDataChannel.RED, BitmapDataChannel.GREEN); bmd.copyChannel(bmd, bmd.rect, new Point(200, 0), BitmapDataChannel.RED, BitmapDataChannel.BLUE);