noun Optics.
the difference in color quality between a color and a reference color that has an equal brightness and a specified chromaticity.

1950–55; chrom- + (lum)inance Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chrominance (ˈkrəʊmɪnəns)
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
[C20: from chromo- + luminance]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The two chrominance components are sub-sampled by two horizontally.
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