CHROMAKEY – TV – Film
System of overlaying one picture electronically over sections of another picture. Chromakey can be quite simple or fiendishly complicated. At a basic level a TV presenter sits in a TV studio with a carefully lit blue background behind her –known as a BLUESCREEN. The blue area that shows up in the picture on the MONITOR can be replaced with suitable moving images from a different source, such as pictures of a holiday destination. The blue colour (chroma) is used to KEY the other images. Using computer power this is a valuable and extremely useful technique that can create astonishing visual displays, or can transport an actor to the landscape of the moon or make him walk on water.
The same technique is used in film eg STAR WARS but normally with a GREEN SCREEN.
See CGI, VIRTUAL STUDIO
