I dunno if this is possible but a game I use, FFXIV has an annoying thing where it changes the tone of shadows along with the scene.
So I want to defog all blacks below x amount without affecting the gamma or brightness. The problem is that this needs to happen whether it has too much red, green or blue, not a specific combination.
For some reason bleach says it does this however I find it instead bleaches whites and not blacks.
I found some images of the game that show my problem:
imgur.com/a/6CKwi