Chroma Keying is an old visual effect trick for placing a subject into a completely new scene. Instead of spending large sums of money for highly wrought sets, producers can just opt for green or blue screens, thanks to chroma Keying. Chroma Keying transforms a video footage of a man pretentiously flying in tight harness to a superhero braving the sky to answer a damsel’s cry in distress.
Chroma Keying, otherwise know as blue screen or green keying and color keying, is accomplished by combining visuals from two different sources. The first source is the foreground subject, shot against a blue or green screen. The second source is the background scene and it can be any stock video footage you have of tall skyscrapers in New York or you can cull to recreate the battle of middle earth using CGI (Computer Generated Imagery).
The two frame sources for Chroma Keying are combined, digitally, to replace anything that is blue or green using the analog video during the digital video editing procedure... click here to read more
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