For Y, Cr, Cb we have a term and definition in Electronic Cinematography.

The digital luminance and color difference signals in ITU-R BT.601 coding. The Y luminance signal is sampled at 13.5 MHz and the two color difference signals are sampled at 6.75 MHz co-sited with one of the luminance samples. Cr is the digitized version of the analogue component R-Y, Cb the digitized version of B-Y.
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