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You can down convert your chroma subsampling 4:2:0 4K
to 4:2:2 1080p or even 4:4:4 1080p
with the extra pixel information.
As for using 4:2:0 you wont really see much difference until you
do extreme color grading, looking at a gradient,
or chroma keying. It is true that broadcast wants 4:2:2 and it does
help if you want to do extreme color grading.
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