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chrominance

[kroh-muh-nuh ns]
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noun Optics.
  1. the difference in color quality between a color and a reference color that has an equal brightness and a specified chromaticity.
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Origin of chrominance

First recorded in 1950–55; chrom- + (lum)inance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for chrominance

chrominance

noun
  1. 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. the information that defines the colour (hue and saturation) of a television image, but not the brightness
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Word Origin

C20: from chromo- + luminance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012