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chrominance

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chro·mi·nance  (krm-nns)
n.
The difference between one color and a reference color of the same brightness and chromaticity.
[Blend of chromo- and luminance.]
chrominance [ˈkrəʊmɪnəns]
n
1. (Physics / General Physics) the quality of light that causes the sensation of colour. It is determined by comparison with a reference source of the same brightness and of known chromaticity
2. (Communication Arts / Broadcasting) the information that defines the colour (hue and saturation) of a television image, but not the brightness
[from chromo- + luminance]
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