Confusion calibrating CS2731

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  • #31006

    Mindas
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    Yes! Finally, this way it worked, seems CN needs all 5 samples.. Now measurement matches in CN and DisplayCAL with HP Z24x EDR file (0.1 deltaE), no need to do manual adjustment. Just don’t have any high-end devices to check if my results are really ok, but knowing that I have amateur devices, I hope it’s max what I can get from it.. and I’m very happy I managed to do it, just with your big help it come true, thanks a lot Vincent!

    Now I’m just wondering, why this HP_DreamColor_Z24x_NewPanel.edr has just one sample instead of 5? It means HP did measurement just once? If I understand correctly, more samples we have, more precise behavior it describes, as we take root mean square, right?

    Also attaching patched EDR file (with HP Z24x data).

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    #31008

    Mindas
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    Sorry, I see cannot attach edr here.

    #31009

    Vincent
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    Great news. For other people: you know what to do: HEX WORK.
    Same for people with faulty HW calibration software like those Benq or LG widegamuts (QLED, GBLED, WLED PFS): they use wrong a RGBLED correction. It’s a llitle more difficult for them becaue they can`t just copy paste, they need to edit headers because their sample (RGBLED) has more than 351, so you need to interpolate & pack again or change headers.

    HP packed only 1 display… because it needs only one… their monitor.

    Xrite, packed U2413 correction (2012revision)among other non exactly related EDR (2011 initial file)… because… you know… they do not care so much and for true GB-LEDs… it does not matter to much. Dell calibration software, Basiccolor, CN.. etc all used Xrite “standard ones” instead of taylor made like that HP or the GB-LED meassured for PA243W form NEC (almost exactly like U2413 GBLED but they use a bblu led with just a slighty shorter wavelength nothing to be worried about)

    #31021

    Алексей Коробов
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    #31041

    Алексей Коробов
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    Dear Mindas, I ask you to pass 5 tests in DisplayCAL and place reports here. I published my i1p2 measurement data and notes: https://hub.displaycal.net/forums/topic/displaycal-profil-loader-eizo-color-navigator/#post-31015 Required files are attached below.

    Set your CS2731 to some mode calibrated to native gamut using the last EDR change.

    1. Test it with i1Display and HP Z24x spectral correction.
    2. Create i1Display matrix correction based on Z24x spectrum (set “minimize chromaticity difference” option in dialogue). Set matrix correction in correction menu and test again. If DisplayCAL can’t create it, skip this test.
    3. Test it with my CS2731 spectral correction.
    4. Test it with my CS2731 matrix correction (made for my instance of i1Display 3 / Pro).
    5. Create your i1Display matrix correction based on my CS2731 spectral data and make test with it.

    The goal is to show i1display quality influence on result.

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    #31050

    Mindas
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    Dear Mindas, I ask you to pass 5 tests in DisplayCAL and place reports here. I published my i1p2 measurement data and notes: https://hub.displaycal.net/forums/topic/displaycal-profil-loader-eizo-color-navigator/#post-31015 Required files are attached below.

    Hey Alexey, will try to do it as you described, but unfortunately I have to leave home for the weekend, so it will be possible only on Monday I think.

    Hope you are not in a hurry, looking forward to collaborate 🙂

    Mindas

    #31051

    Алексей Коробов
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    Thank you, Mindas! Of course, it’s not urgent.

    #31095

    Mindas
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    Set your CS2731 to some mode calibrated to native gamut using the last EDR change.

    1. Test it with i1Display and HP Z24x spectral correction.

    Hey Alexey,

    which mode do you mean? My last calibration for AdobeRGB was with these HPZ24x forged correction in CN. You want me to test this mode with DisplayCAL using your supplied corrections?

    #31121

    Алексей Коробов
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    I supposed that you’ve calibrated display for native gamut… That’s not matter though, use AdobeRGB CN-calibrated mode for all tests.

    I’m not sure if DisplayCAL allows to create personal colorimeter matrix correction based on HP Z24x spectral correction. It seems that raw spectral measurements file (.ti3 type) is needed. So, skip step 2, but use described approach on steps coming further. I attached .ti3 for Eizo in ZIP bundle.

    I’m waiting for result with patienece…

    #31124

    Vincent
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    I’m not sure if DisplayCAL allows to create personal colorimeter matrix correction based on HP Z24x spectral correction. It seems that raw spectral measurements file (.ti3 type) is needed. So, skip step 2, but use described approach on steps coming further. I attached .ti3 for Eizo in ZIP bundle.

    From Argyll command line runing -d debug mode and a little bit of math

    RGB to XYZ no CCSS = Muncorrected (do not apply -X param)
    RGB to XYZ with CCSS = Mccss (apply -X param)
    Mccmx = 3×3 XYZ to XYZ

    Mccmx x Muncorrected = Mccss

    Mccmx = Mccss x Muncorrected ^-1

    Although debug output matrices are 3 decimals only.

    • This reply was modified 1 month, 2 weeks ago by Vincent.
    #31130

    Mindas
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    I’m waiting for result with patienece…

    Hey Alexey,

    sorry for delay, very hectic time I have. So I did four DisplayCAL test measurements with different corrections you described in these steps. I just skipped step 2, as quickly I could not understand how to do all this math Vincent described..

    In general I can say, the tendency was, with every further step, the results went worse especially in terms of whitepoint as expected.

    Check it out, I attached files.

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    #31137

    Алексей Коробов
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    Thank you very much! Now we see that:

    1. Despite of different red graphs HP Z24x 1nm measurement and my 3.3nm measurement of CS2731 give almost the same result for i1Display 3/Pro. Vincent is right. Graphs difference may come from XYZ-normalization of different data (CCMX curves aren’t real spectrum curves).
    2. CN seems not to make personal correction for colorimeter, calibration result is inacceptable.

    Now I ask you to make some more long job: try to make iterative calibration of your display as described in my post, section 7. After you achieve pretty good WP, make profile test in DisplayCAL using Large verfication testchart (325 patches) and publish it here. You may calibrate your display for AdobeRGB emulation or using its full gamut, this does not matter here. AdobeRGB emulation may only be better for non-CM applications and provides a bit more gradient steps. I use native gamut cause my CMYK+OGV prints gamut exceeds AdobeRGB at some points.

    #31139

    Алексей Коробов
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    P.S. Don’t ruin your current profile/calibration, use another display calibration entry.

    #31140

    Алексей Коробов
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    P.P.S. Use “Testchart for colorimeter correction” between iterations, it is much faster for WP check.

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