Code

var stage = new Stage("canvas", 420, 500, 30); var loader = new Loader(); loader.contentLoaderInfo.addEventListener(Event.COMPLETE, function(e) { var bitmap = loader.content; var bitmapdata = bitmap.bitmapData; var bottomHalf = new Rectangle(0, 250, 420, 250); var point = new Point(0, bottomHalf.y); bitmapdata.threshold(bitmapdata, bottomHalf, point, '>', 0xFFAA0000, 0xFF00FF00, 0xFFFF0000, false); }); loader.load(new URLRequest('img/photo01.jpg')); stage.addChild(loader);

Canvas

Output