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RE: Updated! PostProcess Mods:
by TehCAKE on Tuesday October 4th 2011, 11:24
I wouldn't think you could get VAC banned for adjusting postprocess and graphics settings. thou I can only speak from my personal experiences and as such, I wouldn't like to decide or comment either way for you.
Although personally I've been editing all sorts of variable nothings happend to me. I would suggest you take a look at forums.steampowered.com if you have any concerns regarding Dead Island game modifications and or VAC status about such modifications.