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The difference between any color and a specified reference color of equal brightness; in color television, this reference color is white having coordinates x = 0.310 and y = 0.316 on the chromaticity diagram.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


Short for "chrominance" or color information, which includes its hue (color) and saturation (shade/brightness). Chroma is not a term most people hear or see very often, but it is not entirely hidden (see caption below). See hue and saturation.

Chroma Setting on the Apple TV
The video in this Apple TV media hub is currently set to 4:2:0, which means the color signals are sampled at half the resolution of the brightness (see chroma subsampling). See Apple TV and digital media hub.
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