[quote name='Axel' timestamp='1347660691' post='18067']
Yes. So what? 4:2:0 equals roughly the spreading ratio of cone cells on the retina, which are sensitive only for a color each ('RGB'). The brain combines their signals to form the [i]sharp[/i] image in the center of our field of vision (the borders are blurred like a shallow DoF vignette, and are much less saturated, since outside the fovea the B&W rod cells predominate), interpolating much more color information than any video compression. If our own vision is hardly more than a roughly colored B&W image, how can 4:2:0 make such a big difference? In secondary color corrections, you often feather the masks quite liberally without any problems. We simply have no senses for color resolution.
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We've officially hit rock bottom in pixel peeping.