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don't fear, it's not <16
When you are in RGB and R=G=B=0 you cannot say this is luma=0 (because you still are in RGB)
And Histogram and ColorYUV are YUV-only-functions.
The only point is that CCE/TMPG can be told which Y range to use when CREATING YUV THEMSELVES:
0-255 (will make "superwhite" and "superblack" areas)
16-235 (as AviSynth and CCIR601)
ProCoder (at least 1.0xx) will always use 0-255, so you have to do a pseudo-conversion 0-255 > 16-235 in RGB before.
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