I1Pro2 red gamma elevated compared to I1DPlus

[Guillaume]

So I was working on a calibration for a laptop I own. Everything was right until I wanted to do some I1Pro2 post calibration measurements in HCFR. I used the 2012_10 aligned to 1931_2 matrix to do it for info. (Appendix) In fact when I measured the 10 points grayscale, I got a progressive red negative tilt of 5 to 10 percent from 10% to 100%. Then I tried to solve it by messing with the custom source profile, required for custom whitepoint, gamma and so on, and changing 3DLUT generation rendering intents, but nothing worked. I tried to use the default 1931_2 without the alignement matrix but there was no effect on the problem. Then I randomly thought to use my I1DPlus if this tilt occured. Subjectively there was no red hue in midtones and shadows compared to the white. In the end I obtained a neutral gamma with it. Is it possible that my I1Pro2 is bricked or needs a recertification ? Or is this red hue the result of the noise produced by the black reading ? Thanks

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Appendix :
1.209085 -0.172804 -0.015714
0.121374 0.943158 -0.054192
-0.046581 0.075705 0.994752

[DaniJ]

Can you attach the HCFR measurements file?

[Vincent]

I’ll try to repeat it through argyllcms commandline. If results match, aks this question to argylcms mail list since graeme gill is the person to ask this details.

[Author]

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