title: AS3: copyPixels - Maintaining Transparency On Multiple Copies
body: <p>I need to copy multiple images with transparency to the same BitmapData without the overlapping images' transparencies overwriting the existing pixels.</p>
  
  <p>By default when you use the copyPixels method on a BitmapData with transparency to a BitmapData without transparency, the images layer like I want. The issue is I need to render to a BitmapData layer with transparency to another BitmapData with transparency. I want to maintain the transparency of the bitmapdata but still get the overlapping effect.</p>
  
  <p>Can anyone think of a inexpensive way to achieve this?</p>