Filter – Luma Key
The Luma key filter is a simple keyer that allows you to quickly key out dark or light areas of a video source.
Luma Key options
Cutoff
This slider controls how much of the picture is keyed out. The higher the number the greater the range of brightness that is keyed out.
Softness
This slider controls the fine adjustment at the edge of the cutoff brightness, giving a softer edge to the key.
Reverse Key
This checkbox will reverse the key, so that light areas are keyed out rather than dark areas.