Yes, it says to “not clamp” them throughout the conversion to ITP. My problem is that excel returns “#NUM” with negative numbers. I will recheck the implementation of the formula and report back.
The document talks about negative numbers in Annex 4, paragraphs 3&4. Short story: if you want to analyze only colors within BT.2100 color volume, then negative numbers must be clamped to 0 and, I guess, numbers>1 to 1 (?). But, if you want to consider colors as they are actually measured, then negative numbers should not be clamped.
EDIT: Ok, the formula I used for XYZ-RGB conversion is different from the one suggested in the ITU-R BT.2124 document, probably it has the correct matrix for the BT. 2100 color space while I was using the Rec.709 inverse matrix. After I've implemented that, all is fine. Cheers.
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Last edited by Anger.miki; 08-14-2019 at 02:01 AM.