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Thank you. Makes perfect sense.It is not working for you because you are not using Fullscreen in "Windowed Mode:" options (which you arguably shouldn't, its archaic). This feature will not work if you are using Windowed or Virtual Fullscreen, the game was this way on official Sega release as well.
Thanks for the tip. Does it allow you to change settings per game?It hasn't worked for me in a long time. Maybe even since I was playing on official Sega server. Perhaps it only worked on old CRT monitors or something, idk.
I don't think it would do anything your monitor brightness setting wouldn't do anyway.
Personally I use a program called "Powerstrip" for increasing/decreasing gamma on-the-fly in games which don't have a setting for it. So that might work.