FUSION · NODE REFERENCE
LumaKeyer
Brightness-based keying
Builds a matte from image luminance, letting bright or dark regions become transparent or isolated without relying on hue.
LumaKeyer
Overview
What LumaKeyer does
LumaKeyer maps luminance into alpha using Low/High thresholds and matte finesse controls. It works well on elements that are inherently brighter or darker than their background.
Unlike ChromaKeyer, color does not define the selection. That makes LumaKeyer useful for monochrome effects, matte passes and photographic content where hue varies but luminance contrast is strong.
As with any threshold-based key, preserve intermediate values when motion blur, smoke or soft light edges matter. Hard clipping can make natural semi-transparent material look cut out.
When to use it
Extract bright smoke or light effects
Remove a black/white background
Build a highlight or shadow matte
Create local color-correction masks
Generate mattes from grayscale passes