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Special color modes #703
I've identified four possible editing modes:
When Source is Indexed, it means that the real color came from the palette. And if the Output is RGBA, we can show all kind of RGBA compositions in the final render.
This issue is here to create mockups and discuss if all these modes do make sense. Right now I think that the most straightforward way to implement this is to use RGBA and Indexed as they are right now. Indexed images should support Alpha in palette entries and opacity in cels/layers (automatically converting the output to RGBA, it should be transparent to the user). The only remaining mode is the real-time dithering, that it could be an option in Sprite > Properties dialog for example.