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
Word origin
C20: from chromo- + luminance
chrominance in American English
(ˈkroʊmənəns)
noun
that attribute of light which produces the sensation of color apart from luminance; specif., the color of an object as measured quantitatively in terms of a referencecolor