Spill Suppression

Spill suppression cleans up the green or blue tint that reflects from a chroma key backdrop onto the subject, typically along hair, shoulders, and translucent edges. Even a well-lit green screen casts colored light onto the talent, and after keying that fringe makes the composite look fake. Spill suppression neutralizes or desaturates the offending hue, often replacing it with a color sampled from the new background so edges blend believably. Compositors apply it as a dedicated step after pulling the key, frequently alongside edge refinement and light wrap to integrate the subject into the scene. Done well it is invisible; done poorly you get gray, muddy edges or obvious color shifts. It is an essential finishing move for any green or blue screen work, from interviews to full VFX shots.