chrominance

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chro·mi·nance

 (krō′mə-nəns)
n.
The difference between one color and a reference color of the same brightness and chromaticity.

[Blend of chromo- and luminance.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

chrominance

(ˈkrəʊmɪnəns)
n
1. (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. (Broadcasting) the information that defines the colour (hue and saturation) of a television image, but not the brightness
[C20: from chromo- + luminance]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

chro•mi•nance

(ˈkroʊ mə nəns)

n.
the difference in color quality between a color and a reference color that has an equal brightness and a specified chromaticity.
[1950–55; chrom (atic) + (lum) inance]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.