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i just ask you a different question who stops you from creating a native 10 bit source with 1023 in it?
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Umm, okay, but my questions weren't rhetorical. Nothing stops you from creating a native 8 bit source with 255 in it, but that is - according to broadcast standards - an "illegal" value.
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a bad way to go back to 8 bit is by removing the last too bits truncation. another one would be dithering.
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Dithering still needs a convention as to what values, integer of fractional, correspond between the bit depths.