This will be highly game dependent, however we can get some basic rules together here. The first line is your shadows, next line is midtones, and last is highlights. Inside each of those are your color channels. I don't tune on a per color channel basis but just overall if certain areas need more darkness on shadows and such.
Anything less that 1.0 will darken, anything higher will become lighter.
Just play around and test, you wont break anything.
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