Chroma-keying, a technique commonly used in TV weather reports, is a matte derivation method in which the computer sources a specific color to create a key signal. Weather forecasters do not actually see the map on the screen, they only see a solid color.

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Chroma-keying involves replacing a solid color background (often green or blue) with another image or video, such as a weather map. Weather forecasters look at a solid color in the studio and rely on monitors to see how the map appears to viewers.

Chroma-Keying, a Technique Commonly Used in TV Weather Reports, Is