Animating colors?

Can I animate color changes over time in a painted area? Say, I want to animate a character’s head turning green when getting sick!

Try a Colour-Scale-Effect…
If you like here is a short video demonstration:
http://web.mac.com/nolan.scott/Gallery/colour_scale_effect.html
(no sound, it’s all fairly simple and self-explanatory)

The original resolution is 1280 x 720 pixels, if needed, please download the movie…

Regards
Nolan