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Agree completely with Michael. And for folks like me who use QTR for selective toning of regular prints (not DTP or negatives), this tonal transition can be profoundly impacted. I often use "copy curv

I believe Hendrik got the desciption here https://www.quadtonerip.com/Calibration.pdf I was surprised by it, so I tried it (experiment vs theory, lol)

Here is plot after linearization. Minor differences between the two curves, nothing to write home about. Likely multiple sampling and using average values would fix the minor differences.

Hello Roy, Thank you for your comments & thoughts. Amen to experimenting. The curve 1 and 2 renditions come from respective *.quad files data (of course pre-linearization), imported into Excel for the