Also called *green-screen*, chroma-key is a video-production technique that assists in replacing parts of a video with something else.

Chroma-key compositing is a way to make replacing parts of a video with something else easier. Usually a color that is not present in a scene will be selected and any parts that are to be replaced will be covered or painted in that color. Later, in post-production, the color is replaced with other imagery. The selected color is the called the chroma-key.

This technique is often called green-screen or blue-screen because it is frequently used to replace the background so that it looks like the actors are somewhere else. It is also often used by having an actor wear a tight, chroma-key-colored outfit so that they can be removed entirely.

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