inverting graphics

Howdy!

Does anybody know if theirs a fast way of inverting graphics, by inverting I mean making the transparent color solid, and all other colors transparent.

Thanks

Mr Brine

<edit>
simply using two graphics, one "normal" and one "inverted" would be fast.

or is there a reason this would not do?

Ive got tons of animation frames so I dont really wanna have to keep to copies of the inverted frames in memory....

Do you want any alpha involved ?

Write an application that will invert your sprite animations. That should do the trick.