I am editing a head and I am trying to change the colours from one to another smoothly...is there any other way other than creating multiple images and then putting them in unfreez (what I normally do)? because it will take so many images...thx  

Depends a lot on what you're using.

On photoshop this is relatively easy to achieve using tweening and opacity.

Basically you'll have two layers, one with the original color, and one with the new. On frame 1 you want to set the opacity of the new color layer to 0%. On frame 2 you'll want to set the opacity of the new color to 100%. Then hit the tween button and it will fade the colors together for you:






Apologies for the crappy tutorial quality.  

Thanks! I get it but I only have photoshop cs2....would it work? And the color I am trying to change is the eyes

Hmmm...I don' want to pay for Photoshop CS6....I wonder if I can do a trial  

CS2 should have tweening, yes.  

ok thanks, it works! say im trying to just animate the eyes on a head. Would I have to do the eyes separately and then add each frame onto the head? cuz that would be a lot of copy and paste lol  

hmmm, it seems like when I try to select all of the frames, then I press tween, it doesn't work...