A guys . . .
Both SD and HD have the same "color space" which is 24 bit RGB - which means they will both have the same gray scale (256 steps) and the same number of colors (16.7M)
The difference (601 versus 709) is that HD is more accurate in rendering colors. Red will be red, not orangish red.
And that is why it is preferred to use a HD encoded calibration disk.
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