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BKSTS Illustrated Dictionary of Moving Image Technology, 4th Edition by Martin Uren

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4:1:1 Refers to the ratio of digital video sampling frequencies for the luminance and two colour-difference signals. It is one of a series of ratios defined and specified in ITU-R BT.601 and is the standard used in the DVCAM digital videotape recorder formats.

4:2:0 Refers to the ratio of digital video sampling frequencies for the luminance and two colour-difference signals. It is the standard used in DVCPRO digital videotape recorder formats. The colour-difference signals are sampled only on alternate lines.

4:2:2 Refers to the ratio of digital video sampling frequencies for the luminance and two colour-difference signals. It is one of a series of ratios defined and specified in ITU-R BT.601 and has become the standard used in studio ...

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