Chroma Key

Pulls an alpha matte from a chosen color: a green- or blue-screen key.

Parameter	Control	Range	Notes
Key Color	color swatch		Not modulation-assignable.
Tolerance	Trough	0 to 1
Softness	Trough	0 to 0.5	Feathers the matte’s edge.

Outputs an alpha-only matte, not a recolored image. See Despill for cleaning up color spill left on the subject after keying.