When I use the Verification function of DisplayCAL, Sometimes I find obvious errors when calculating the color difference between the Measured whitepoint and the Assumed target whitepoint
such as the target D65 light source xy 0.3127 0.329 (XYZ 95.05 100 108.91), CCT 6504K,
the actual measured xy 0.3155 0.3313 (XYZ 95.23 100 106.62), CCT 6339K,
Measurement Report shows ΔE*00=0.69, but this is obviously wrong;
after correct calculation, ΔE*00 should be 1.693816
Is there any solution for this problem?
You’re looking at the wrong thing. Measured vs. assumed target whitepoint is what was measured vs a made up number close to the actual white point in the profile. What you should be looking at is the measured vs display profile whitepoint which shows as 1.44
Second the numbers you have in the converter don’t match up with what I’m getting when I do the conversion from xy to Lab so that’s the likely reason for your discrepancy.
Using that site to convert xyY to Lab with ref white set to d65 and Y at 1.0 then using the color difference calculator gives me almost the same results as your measurement report.
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