Degree of transparency.

[Maxim]

To put it another way, if you're dealing with input images that go up to 248 then your output should too. But the assertion that that's the only way things work would be wrong.

On the other hand, "converting to GBA colors" gives identical results with either implementation.

[Troy Lundin]

Edit: Made a new thread for the program here: https://www.vgmaps.com/forums/index.php?topic=1770.0

[Peardian]

Now, I'm afraid I don't know much about different GBA blendings, but if you want a game that might have different kinds, Yoshi's Island: Super Mario Advance 3 has (I think) some different kinds. With the mode7 blob enemies, submarine room water, dark room spots, and other special effects, it might be worth checking into.

[Troy Lundin]

Sweet, I'll check 'em out.

There are only three modes of blending. Well, two really. The first is alpha blending and the second is brightness adjustment (fade-in, fade-out).