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4:2:2 - A ratio of sampling frequencies used to digitize the luminance and color difference components (Y, R-Y, B-Y) of an image signal. The term 4:2:2 denotes that for every four samples of the Y luminance, there are two samples each of R-Y and B-Y, giving less chrominance (color) bandwidth in relation to luminance. This compares with 4:4:4 sampling where full same bandwidth is given to all three channels – in this case usually sampled as RGB.