DUST2DEATH
♥♥♥♥♥ Fox
Most likely funky monitor settings/not calibrated.I notice a lot of people complain about these but I rather like them. Seems I can make out zombies pretty well with them on at night. Maybe it's in the graphics settings?
Most people dont have the tools (myself included) to calibrate a monitor/tv. Luckily, TFT central exists

http://www.tftcentral.co.uk/articles/icc_profiles.htm
Find your panel, apply settings, profit. 5 mins work if that.