Use two backgrounds to achieve 30 colors

[pokepress]

Things to know:

• The Genesis can't hold two full screens of graphics in VRAM (a full screen uses about 35k and there is only 64k of VRAM). As such, compression must be turned on so that the library can attempt to find redundancies, or tiles will start overwriting each other. In theory, it is possible that even with compression, there could be a case where the two backgrounds require too many distinct tiles, but I wasn't able to achieve that and it would be difficult to purposely design an image this way.
• The library has a method to fade all palettes to black simultaneously, but not a way to fade in palettes simultaneously unless they use the same colors.

[joeyparrish]

The flashes of black between each slide is a problem for me. I'm going to tinker with the "fade" part and see if I can make the transition faster and smoother.

[joeyparrish]

I have not been successful, and I don't have more time for it right now. If you have ideas on how to transition between slides without fading the palettes to black, I would appreciate it. I think some palette glitching is better than a hard fade to black on my (mostly) white slides.