Post-processing in games is a set of visual effects applied after the 3D scene has been rendered, to make the final image look better, more cinematic, or more dramatic.

What it does

  • Adds polish to the image, like bloom, color grading, motion blur, depth of field, and ambient occlusion.
  • Helps set the mood, for example making a horror game look darker and more tense or a bright game feel more stylized.
  • Can improve realism by simulating things like camera focus or light bleeding from bright objects.

Tradeoffs

  • It usually costs performance, because the game has to do extra rendering work after the main scene is drawn.
  • Too much post-processing can make visuals blurry, overly dark, or distracting if it is not tuned well.

Simple example

Imagine a game scene without post-processing: it looks clean but plain. Add bloom, and bright lights glow; add color grading, and the whole scene feels warmer, colder, or scarier.

In short

Post-processing is basically the game's final visual makeover layer, used to enhance style, realism, and atmosphere after the core graphics are already rendered.