Term of the Moment
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chroma
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 Hub
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 hub and digital media hub.