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Chroma key, also known as blue screen or green screen, was a colored backdrop used for shooting scenes whose backgrounds would later be filled in with CGI scenery.
The call sheet for the episode "The Andorian Incident" listed a green screen in the mess hall scenes, replaced later in post-production by a moving starfield. Another green screen was used during filming of this episode and raised on a platform for a view through a metallic door in a Vulcanreliquary, depicting later a CGI-created matte painting of a Vulcanlistening post. ("The Andorian Incident" call sheet)