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If I remember correctly, gifs are palette based and only 256 colors. They also don't have alpha transparency, instead having 1 transparent entry in the palette,
by benjaminjackman 9y ago
If I remember correctly, gifs are palette based and only 256 colors. They also don't have alpha transparency, instead having 1 transparent entry in the palette, so for a gif to smoothly blend into its background it has to be pre-rendered against that background.