download SweetFX-Configurator_standalone and  SweetFX_1_5-23364  extract both in C:\Program Files (x86)\Steam\steamapps\common\XCom-Enemy-Unknown\XEW\Binaries\Win32 unless if you play enemy unknow it has to be C:\Program Files (x86)\Steam\steamapps\common\XCom-Enemy-Unknown\Binaries\Win32  launch sweetfx configurator select xew.exe.enable tonemap gamma 0.850, vibrance intelligence -0.10,vibranceRGB first put this in ----- save close configurator open again and the 3 spaces should be gone then put this in 2.00, 4.00, 2.00 if the game doesnt launch delete or remove  dxgi.fx and dxgi.dll from the xew folder,done.