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- How to decimate for chrominance
- 4:2:2 -> Horizontally subsampled colour signals by a
factor of 2. Each pixel is two bytes, e.g., (Cb0, Y0)(Cr0, Y1)(Cb2, Y2)(Cr2,
Y3)(Cb4, Y4) ...
- 4:1:1 -> Horizontally subsampled by a factor of 4
- 4:2:0 -> Subsampled in both the horizontal and vertical axes
by a factor of 2 between pixels as shown in the Fig. 6.30.
- 4:1:1 and 4:2:0 are mostly used in JPEG and MPEG (see Chapter 4).