Viz Vectar Plus User Guide
Version 1.2 | Published April 12, 2022 ©
Crop Source
It is common for unwanted items to remain after chromakeying.
Common examples include microphones or lighting fixtures dangling from above, or perhaps a harsh crease, blemish or tear in the background screen. Crop Source, located in the Image tab just below LiveMatte, can serve as a garbage matte to remove this sort of intrusion.