Use the following case-sensitive codes after enabling the Postprocessing cheats with the boolProp enablePostProcessing true code.

Code	Effect
bloom	Blur effect; red, green, blue value must be between 0 and 255, and x (bloom) between 0.0 and 1.0
vignette	Centered blur effect; centerX and centerY are screen coordinates; x (vignette) must be between 0.0 and 1.0
filmGrain <0.0-1.0>	Grainy screen effect
letterBox <0.0-0.4>	Letterbox screen effect