MARC KITAEN

Chroma key is often referred to as "blue screen" or "green screen" photography, because of the frequency of those colors being used as backdrops.

Chroma key is the process used to insert a new background behind a model or object. The subject is photographed against a background of a single color (The backing screen is typically a blue screen or green screen, the two colors that contrast most to human flesh tones). Then that single color is removed digitally.
 
When the solid color is digitally extracted, the masking process leaves transparency (blank space) around your subject. The important point is that once the solid color background (in this case, blue or green) is removed, you can insert any imagery you want in its place. This is often referred to as "pulling a key". A key is the blank area, techincally called an "alpha channel" that is created when the solid color background is removed.

The most common example of chroma keying is the TV weather program. A TV weather person is shot in front of a blue/green screen. A computer then removes the solid blue background and replaces it with a weather map, or any other image or background scene in its place.

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