r.Color.Mid
VarUnreal Engine Var console variable.
rColorMid
Description
Allows to define where the value 0.5 in the color channels is mapped to after color grading (This is similar to a gamma correction) Value should be around 0.5, smaller values darken the mid tones, larger values brighten the mid tones, Default: 0.5
Usage
r.Color.Mid [value]Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.

