Hello all, I found it quite interesting to read in the X-Rite XRGA whitepaper(*1), that the ColorMunki (Photo/Design) already conforms to the new X-Rite XRGA standard. I'm still struggling to fully understand what's the magic behind the XRGA concept, but according to the whitepaper there is the possibility for measurement differences as high as 1,6 dE*ab (mean: 0,6 dE*ab) in comparison to an i1Pro (GretagMacbeth). XRGA conformity has an influence on the measured spectral data, so this must also have an influence on the measured values obtained with the combination ColorMunki+ArgyllCMS. This should also mean that values measured with ArgyllCMS+ColorMunki are not direct comparable with i1Pro+ArgyllCMS based values without applying a correction matrix. In practice: I measured the white balance patch of my newly acquired ColorChecker Passport with the Argyll/ColorMunki combo and got different values (Lab D50: 81.08_0.17_-0.03) compared to Robin D.Myers technical report on the ColorCheckerP (81.34_-0.13_0.28). But I know, the differences in measured values don't proof that XRGA is the reason. Nevertheless, do you still think, that's safe to directly compare ColorMunki and i1Pro measured values when using ArgyllCMS? Regards, Juergen (*1): http://www.xrite.com/documents/literature/en/L7-492_i1iSis_RevE_FINAL_en.pdf