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Clicking the Game Gamma button accesses the Game
Gamma Properties.
Game Gamma Properties
Red Green
Blue sliders
These controls allow you to increase or decrease
the color brightness of Direct 3D and OpenGL
games played in fullscreen mode.
RGB Lock
Uncheck this to adjust the RGB sliders
individually. Check this to adjust all three sliders at
the same time.
Defaults
button
This allows you to reset the Game Gamma
settings to default values.