Re:John Carmack on JPEG
by cvwright on Friday June 04, 2021 @07:59PM
(#27400561)
What’s 4:1:1? What people call 4:2:0 is actually 4 pixels of Y and 1 each of Cb and Cr.
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Re:John Carmack on JPEG
by cornstalks on Friday June 04, 2021 @08:20PM
(#27400720)
Wikipedia has a decent article with visuals: https://en.wikipedia.org/wiki/Chroma_subsampling#Sampling_sy...
The difference between 4:1:1 and 4:2:0 is that in 4:1:1 the chroma covers a 1x4 line of pixels whereas in 4:2:0 the chroma covers a 2x2 square of pixels.