What are the correct D65 coordinates for CIE 2012 10°?

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  • #28505

    St0RM53
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    I’ve decided to try CIE 2012 10° with D65 standard illuminant but i am unsure how DisplayCal controls the whitepoint handling.

    I’ve tested both standard CIE 1931 2° (0.31271,0.32902) and CIE 1964 10° (0.31382,0.33100 of which should be the same for CIE 2012 10°) at the white calibration stage and if i use the 10° one it seems to want me to calibrate to a slightly warmer whitepoint of about ~6460K which was unexpected as i thought it should be slightly cooler.  Carrying on, doing a full calibration with the 2° whitepoint and CIE 2012 10° selected results in a slightly cooler final whitepoint of about ~6540K.

    Now i am completely unsure which of the 2 whitepoint coordinates should be the correctly selected one as i think the software does change it upon calibration.

    Can you please point me to the right path?

    Kind regards

    #28510

    Vincent
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    I’ve decided to try CIE 2012 10° with D65 standard illuminant but i am unsure how DisplayCal controls the whitepoint handling.

    Useless. 2 degree.

    I’ve tested both standard CIE 1931 2° (0.31271,0.32902) and CIE 1964 10° (0.31382,0.33100 of which should be the same for CIE 2012 10°) at the white calibration stage and if i use the 10° one it seems to want me to calibrate to a slightly warmer whitepoint of about ~6460K which was unexpected as i thought it should be slightly cooler.  Carrying on, doing a full calibration with the 2° whitepoint and CIE 2012 10° selected results in a slightly cooler final whitepoint of about ~6540K.

    Now i am completely unsure which of the 2 whitepoint coordinates should be the correctly selected one as i think the software does change it upon calibration.

    Can you please point me to the right path?

    Kind regards

    Need to change oberver too, not only coordinates. Coordinates ar observer dependent. If want to try newer observer for your display use 2 degree 2012, not 10.

    #28511

    St0RM53
    Participant
    • Offline

    I’ve decided to try CIE 2012 10° with D65 standard illuminant but i am unsure how DisplayCal controls the whitepoint handling.

    Useless. 2 degree.

    I’ve tested both standard CIE 1931 2° (0.31271,0.32902) and CIE 1964 10° (0.31382,0.33100 of which should be the same for CIE 2012 10°) at the white calibration stage and if i use the 10° one it seems to want me to calibrate to a slightly warmer whitepoint of about ~6460K which was unexpected as i thought it should be slightly cooler.  Carrying on, doing a full calibration with the 2° whitepoint and CIE 2012 10° selected results in a slightly cooler final whitepoint of about ~6540K.

    Now i am completely unsure which of the 2 whitepoint coordinates should be the correctly selected one as i think the software does change it upon calibration.

    Can you please point me to the right path?

    Kind regards

    Need to change oberver too, not only coordinates. Coordinates ar observer dependent. If want to try newer observer for your display use 2 degree 2012, not 10.

    Of course i am changing the observer to CIE 2012 10°.  But what is the correct whitepoint coordinate to use for D65 on this observer? 0.31271,0.32902 OR 0.31382,0.33100?

    • This reply was modified 4 weeks, 1 day ago by St0RM53.
    #28513

    Vincent
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    IDNK the exact values for 2012 but for 10 degree they should be closer to 2nd one because it’s 10 degree. Anyway, if in doubt do the integrals in an excel spreadsheet (SPD x bar curves, then sum). D65 SPD and CIE 2012 10 degree is in xspect.c sources from ArgyllCMS.

    Edit: AFAIK validation (HTML report) in DisplayCAL is locked to 2 degree 1931. If you wish to check after calibration white it may be easier & safe to run spotread or dispcal (calibrated report -r or -R I do not remeber) on command line ensuring you force the use of your desired observer.
    And for displays use 2degree.

    • This reply was modified 4 weeks, 1 day ago by Vincent.
    #28515

    St0RM53
    Participant
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    Ok thank you, this explains the variation in the report.

    But why do you recommend the use of 2 degrees other than what is everybody using and therefor mastering content with? I am asking since it’s proven experimentally that there is perceivable change from 2 degrees to 10 degrees measurements.

    #28516

    Vincent
    Participant
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    It’s a display in short range + shared observer which was used for other content

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