Hi, I don't know how many users do monitor profiling (I remember an old discussion with Pierre...). It has been a long time since I did it but now that I tried to do it again I have unsatisfactory results in terms of brightness. The DeltaE is great (0.35) but the gamma is really high, such that it hurts the eyes after a short time. Also, the custom calibration disables the brightness/lightness OSD controls so I can't lower it. I used the Rec709 color space which has gamma 2.4 instead of the normal 2.2 value of the sRGB space. Actually with a higher gamma you should get darker results. My monitor (Dell UO2716D) is a wide gamut type and natively supports various color spaces: sRGB; Rec709; AdobeRGB and DCI-P3 (98%). It should have no problem with Rec709 at gamma 2.4. Can you explain why I get too bright a result? I use Argyll CMS with DisplayCAL and Datacolor Spyder5 colorimeter.