color matrix filter

multipart project 3
part 3 of, I don't know, like 5

Background:
There are these colorful transparent sprites, but I'd rather have something that's less attention-grabbing. I think a color matrix filter can do the job, and keep the fine details in the original sprite.

Task:
- apply a ColorMatrixFilter to a sprite
- render it to a BitmapData for later use
- come up with an appropriate matrix