I422
Like I420, I422 has one luma plane Y and 2 chroma planes U, V.
Y Y Y Y Y Y
Y Y Y Y Y Y
Y Y Y Y Y Y
Y Y Y Y Y Y
Y Y Y Y Y Y
Y Y Y Y Y Y
U U U
U U U
U U U
U U U
U U U
U U U
V V V
V V V
V V V
V V V
V V V
V V V
However, in I422, chroma planes (blue and red projections) are sub-sampled only in the horizontal dimension, still by a factor of 2. Thus, there is the same amount of lines in chroma planes as in the luma plane.
For a 2×2 group of pixels, there are 4 Y samples and 2 U and 2 V samples each. The depth is 4×8+2×8+2×8=64 bits per 4 pixels, so 16 bits per pixel.
Some video codecs support I422 (optionally) for higher quality video encoding.
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