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Originally Posted by colours
The midpoint is 127.5 for full-range 8-bit video, and multiplying by 257 just gives you 32767.5, which is the midpoint for full-range 16-bit video.
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127.5 agreed, theoretically (0+255)/2=127.5, and 127.5 is not an integer.
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It is a known problem that this convention for full-range YCbCr fails to accurately represent any pure grey colour, which is why there's another convention where the nominal minimum is 0 and the nominal maximum is 2^n, which in turn runs into the problem of failing to accurately represent pure red (#FF0000) and pure blue (#0000FF).
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agreed, and instead of assuming representing any pure gray color is impossible, I think it makes sense to round 127.5 to 128 and gray colors will be representable, and I will hold on to my point before you link me a doc that explains how full range YCbCr works in detail, got noda last time I googled about full range YUV
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Also, please type English.
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I'm 19 not 91 and I'm good with the language I'm typing, and I will roll with it, you don't like it? suck it, bite me! bi-o-tch