Revision: 47236
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at June 3, 2011 08:17 by Winkyboy
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private function invert(oldBmp:Bitmap):Bitmap {
var source:BitmapData = oldBmp.bitmapData;
var destin:BitmapData = source;
var rectan:Rectangle = new Rectangle(0, 0, source.width, source.height);
// Replace all transparent pixels with a solid color
destin.threshold(source, rectan, new Point(), "==", 0x00000000,0xFFFF0000);
// Replace all the pixels greater than 0xf1f1f1 by transparent pixels
destin.threshold(source, rectan, new Point(), "==", 0xff656565,0x0000FF00);
return new Bitmap(destin);
}
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This inverts the transparency on a Bitmap (probably supplied a PNG source) that specifically has two colors in it; "#656565" and "transparent" - you can tweak the threshold lines specifically if you'd like to modify that to use a range, or whatever. Adapted from http://stackoverflow.com/questions/608087/flex-actionscript-white-to-transparent and http://www.sephiroth.it/tutorials/flashPHP/thresold/
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AS3 invert image transparency
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ActionScript 3