A:B:C Notation
A:B:C Notation – The a:b:c notation for sampling ratios, as found in the ITU-R BT.601 specifications, has the following meaning: a) 4:2:2 means 2:1 horizontal downsampling, no vertical downsampling. Think 4 Y samples for every 2 Cb and 2 Cr samples in a scan line. b) 4:1:1 ought to mean 4:1 horizontal downsampling, no vertical. Think 4 Y samples for every 1 Cb and 1 Cr samples in a scan line. It is often misused to mean the same as 4:2:0. c) 4:2:0 means 2:1 horizontal and 2:1 vertical downsampling. Think 4 Y samples for every Cb and Cr samples in a scan line. Not only is this notation not internally consistent, but it is incapable of being extended to represent any unusual sampling ratios, that is different ratios for the Cb and Cr channels.
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