chroma-key

noun
chro·​ma-key | \ ˈkrō-mə-ˌkē How to pronounce chroma-key (audio) \

Definition of chroma-key

: a photographic compositing technique based on the separation of colors in the original images especially : blue screen

First Known Use of chroma-key

1974, in the meaning defined above

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The first known use of chroma-key was in 1974

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