Open up the cheat window by pressing CTRL + Shift + C and type in the code that you need.

• Postprocessing codes                        Printer Friendly version
  NOTE: Do Not enable or use the Postprocessing cheats unless your video card supports pixel shaders. The following codes require that Postprocessing be on.
  • boolProp enablePostProcessing true/false : Will turn Postprocessing on/off
  • bloom [r g b #] : Blur effect - the red, green and blue value must be between 0 and 255, #(bloom) must be between 0.0 and 1.0
  • vignette [ centerX centerY #] : Centered blur effect - centerX and centerY are screen coordinates, #(vignette) must be between 0.0 and 1.0
  • filmGrain # : Will make the screen grainy, # = 0.0 to 1.0
  • letterBox # : Will add a letterbox effect to the view, # = 0.0 to 0.4