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Hi.
For the displaycal validation report, there seems to be an error in the DE2000 calculation in it?
When converting XYZ values to lab, the reference white point in lab space always uses the white point normalized to 100 (Y=100), but if my monitor is calibrated to a target brightness other than 100nit, then the de2000 calculation is all wrong!In both colourspace and calman, the white point coordinates of the maximum luminance are used for the lab conversion, not normalized to 100
So is there something I’m overlooking?
Because report is by default PCS relative (it’s actually what any ICC color management engine will do in real life: Adobe & such, they do not care about WP or actual luminance, calculations from image colorspace to display colorspace are ALWAYS whitepoint relative, otherwise you won’t open a ProPhotoRGB TIFF properly on a D65 display)
Meanwhile calman al CS aim to a reference which gives you the totally useless calman grayscale report, a comparison between measured grey and reference D65 grey instead of doing it against measured white, then report reparatedly error in white vs ICC profile and vs assumed closest daylight.
