I think gamma adjustment instead of brightness would make more sense. (Ideally there would be both) Gamma logarithmically lifts the dark parts without affecting the bright parts of a scene too much. Meaning the whites wouldn’t be crushed and you don’t have to readjust the slider for the bright scenes.
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Hey there, I can't really tell if it would be better, since RenPy doesn't allow for gamma manipulation. I have only a couple of image altering matrices to work with (https://www.renpy.org/doc/html/matrixcolor.html) mainly brightness and contrast. Feel free to correct me here :)
Hmmm, don’t know why they wouldn’t include that as a standard transform. Not sure if this is just hidden away somewhere but apparently a renpy-dev made a shader function for gamma correction. Hope that helps.