(in colour television) a special effect in which a coloured background can be eliminated and a different background substituted Also called colour separation overlay


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  • Chroma-key

    noun, Television. 1. an electronic special-effects system for combining a desired background with live foreground action.

  • Chromat-

    1. variant of before a vowel: chromatid.

  • Chromate

    [kroh-meyt] /ˈkroʊ meɪt/ noun 1. a salt of , as potassium chromate, K 2 CrO 4 . /ˈkrəʊˌmeɪt/ noun 1. any salt or ester of chromic acid. Simple chromate salts contain the divalent ion, CrO42–, and are orange chromate chro·mate (krō’māt’) n. A salt of chromic acid. chromate (krō’māt’) A chemical compound containing the group […]

  • Chromatic

    [kroh-mat-ik, kruh-] /kroʊˈmæt ɪk, krə-/ adjective 1. pertaining to color or colors. 2. Music. /krəˈmætɪk/ adjective 1. of, relating to, or characterized by a colour or colours 2. (music) adj. 1590s (of music), “progressing by half-tones;” 1831 as “pertaining to color,” from Latin chromaticus, from Greek khromatikos “relating to color, suited for color,” from khroma […]

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