[DustyPorViva]

obj.replacecolor(#000000,#FFFFFF)
Applies to images and gani's alike. Replaces any instance of the first color(hex value) with the second in the object.

Also, a gani command:

REPLACECOLOR int #000000 #FFFFFF

While on the topic of gani commands, the ability to do something like...
COLOREFFECT {0,1,2,3} 1 1 1 .5
to apply the effect to all sprites in the array. This should be applied to all gani commands.