keying out

Verb

key out (third-person singular simple present keys out, present participle keying out, simple past and past participle keyed out)

1. (transitive) To remove (something) or make (something) transparent in a scene through the use of a chromakey.
   • Blue screens are much easier to use when filming dark scenes, where there shouldn't be much light. Also, they're easier to key out around objects that melt into the green screen, like blond hair. Still, blue screens are more expensive to use as they need a lot more light to work properly.2021 September 11, Anina Ot, “What Is a Green Screen and How Does It Work?”, in MakeUseOf, archived from the original on 20 Jun 2023