chrominance

[ kroh-muh-nuh ns ]
/ ˈkroʊ mə nəns /

noun Optics.

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

Origin of chrominance

First recorded in 1950–55; chrom- + (lum)inance

British Dictionary definitions for chrominance

chrominance
/ (ˈkrəʊmɪnəns) /

noun

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
the information that defines the colour (hue and saturation) of a television image, but not the brightness

Word Origin for chrominance

C20: from chromo- + luminance