ActionScript 3.0 Note

import com.adobe.images.PNGEncoder;
import com.adobe.images.JPGEncoder;

var _bitmapData:BitmapData = new BitmapData(mc.width,mc.height);
_bitmapData.draw(mc);
var _byte:ByteArray = PNGEncoder.encode(_bitmapData);
//var _byte:ByteArray = JPGEncoder.encode(_bitmapData);
var _file:FileReference = new FileReference();
_file.save(_byte ,"file.png");