I would like to turn the gamma up on game but doesn't seem to set higher even if I try it in the config in or outside of game and it looks way too dark on my monitor

You can't unless you play in true fullscreen (which requires launching without ashita).

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i was having problems with the game being incredibly dark at night. brightness was all the way up. f11 would just highlight character models and select hallways in San'D Oria but the rest of the environment was still pitch black. Figured out that it was the bumpmapping that my computer didn't like.