How is Nintendo approaching colour with GBC and GBA games?
I know some GBA games had special palettes when plugged into the Game Boy Player. But some games look fine tuned for a better result. Also GBC games look very nice, better than what the usual colour correction option in an emulator can achieve.
Basically, using the raw color info from the GBA as is, is not necessarily a good idea so you try to change the saturation and gamma over it, maybe even brightness.
This page shows a real idea of how things are pretty much considered by the community in terms of color processing when you try to appear closer to the actual screens of the GBA. Though GBA NSO seems to be debatable in terms of "accuracy" but to be fair maybe they wanted to "improve" the colors in their own way.
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