Check a hardware calibrated display with dispcalGUI

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  • #1739

    thomashas SourceForge
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    Hi,

    I have got a wide gamut monitor with the possibility of Hardware calibration.
    http://www.samsung.com/us/computer/monitors/LU32D97KQSR/ZA
    I calibrated with nce one profile native colour and another in sRGB.
    NCE write the results to the monitor LUT and also creates an icc profile (not importable in dispcalGUI but readable with ICC Profile Inspector) but my
    windows ICM is disabled because I am not sure If I should use the icc profile additional to the Hardware Monitor Profile.

    Then I exported a RAW from Lightroom to sRGB and was wondering why the
    red colours appears different when I am switching the monitor between sRGB and Native Profile.

    I used dispcalGUI to check this: TOOLS -> Report on uncalibrated device.
    than Report on calibrated device.

    I’ve got this:

    11:13:56,907 Uncalibrated response:
    11:13:56,909 Black level = 0.1510 cd/m^2
    11:13:56,911 50% level = 25.87 cd/m^2
    11:13:56,913 White level = 118.67 cd/m^2
    11:13:56,914 Aprox. gamma = 2.20
    11:13:56,917 Contrast ratio = 786:1
    11:13:56,918 White chromaticity coordinates 0.3135, 0.3292
    11:13:56,920 White Correlated Color Temperature = 6458K, DE 2K to locus = 4.2
    11:13:56,922 White Correlated Daylight Temperature = 6459K, DE 2K to locus = 0.5
    11:13:56,924 White Visual Color Temperature = 6312K, DE 2K to locus = 4.0
    11:13:56,926 White Visual Daylight Temperature = 6476K, DE 2K to locus = 0.5
    11:13:56,928 Effective Video LUT entry depth seems to be 8 bits
    11:13:56,930 Black drift was -1.#IND00 DE
    11:13:56,932 The instrument can be removed from the screen.

    11:16:48,380 Current calibration response:
    11:16:48,382 Black level = 0.1316 cd/m^2
    11:16:48,385 50% level = 25.98 cd/m^2
    11:16:48,387 White level = 119.10 cd/m^2
    11:16:48,389 Aprox. gamma = 2.20
    11:16:48,392 Contrast ratio = 905:1
    11:16:48,394 White chromaticity coordinates 0.3132, 0.3284
    11:16:48,396 White Correlated Color Temperature = 6483K, DE 2K to locus = 3.9
    11:16:48,399 White Correlated Daylight Temperature = 6484K, DE 2K to locus = 0.9
    11:16:48,402 White Visual Color Temperature = 6346K, DE 2K to locus = 3.7
    11:16:48,405 White Visual Daylight Temperature = 6514K, DE 2K to locus = 0.8
    11:16:48,407 Black drift was -1.#IND00 DE

    I had expected no difference between calibrated and uncalibrated measurements. Because there is no icc-Profile loaded in Windows.

    Questions

    1.)
    Can anyone explain this difference between -r and -R?

    2.)
    Can I also check the red/green/blue x,y values with dispcalGUI (or nativ argyll cmds)
    against my hardware calibration values? Perhaps against a target file.

    Thanks in advance

    • This topic was modified on 2015-06-24 10:30:48 by thomashas.
    #1740

    Florian Höch
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    Hi,

    my windows ICM is disabled because I am not sure If I should use the icc profile additional to the Hardware Monitor Profile.

    If the monitor is hardware calibrated to sRGB, you still need to assign an appropriate display profile in Windows color management settings so that color managed applications can work correctly.

    Can anyone explain this difference between -r and -R?

    The differences seem to be down to the measurement repeatability. ‘Uncalibrated’ vs. ‘calibrated’ whitepoint chromaticity has a dE 2000 of only 0.3. The only thing that seems slightly off is the black point. What instrument are you using?

    2.) Can I also check the red/green/blue x,y values with dispcalGUI (or nativ argyll cmds)

    After assigning the sRGB profile in Windows, open dispcalGUI and set “Settings” to “<Current>”. Then go to the verification tab, set “Simulation profile” to sRGB, and enable “Use simulation profile as target profile”. Tone curve should be set to “Unmodified”. Then select any of the verification charts and generate a measurement report.

    • This reply was modified on 2015-06-24 17:18:14 by fhoech.
    #1741

    thomashas SourceForge
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    thanks for Information.

    If I proceed I got an error: “Invalid Profile”

    I have mentioned:
    I am not able to Import the creICC Profile into the GUI
    via File Load Settings/Profile Info

    But I can read it with ICC Profile Inspector or via

    http://www.iccview.de
    Profile type: Matrix 3×3
    Device type: Display
    Color space: RGB
    Conn. space: XYZ
    Gamut: 9.127.586 cubic color units
    Date: 23 Jun 2015, 17:50:16
    Copyright (c) 2006 Samsung Electronics Co., Ltd0000000000

    I am using: Colormunki Photo Spectrometer

    File is attachedn

    Attachments:
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    ColorMunki Photo on Amazon  
    Disclosure: As an Amazon Associate I earn from qualifying purchases.

    #1743

    Florian Höch
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    If I proceed I got an error: “Invalid Profile”

    It seems the encoding of certain strings in the profile (‘moldavian’ and ‘kazakh’) is not supported, and the affected tags are also not adhering to the ICC spec. I’ll work-around this with an update. I have attached a modified version of the profile with the strings removed as an interim solution.

    I am not able to Import the creICC Profile into the GUI
    via File Load Settings/Profile Info

    You don’t have to, and it really only makes sense for dispcalGUI-created profiles.

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    #1745

    thomashas SourceForge
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    Thanks it works!

    Am I able to generate such a icc-file (but more compatible as nce-files) with dispcalGUI with only profiling info?

    That means: I do the hardware calibration/profling with nce and throw away the created icc profile because it isn’t 100% compatible.
    Than I use dispcalGUI only to measure the monitor and create a ICC file only with profile- and without calibration info. That means only profiling and no calibration.

    Is there a way in dispcalGUI? How?

    Thanks

    #1746

    Florian Höch
    Administrator
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    Than I use dispcalGUI only to measure the monitor and create a ICC file only with profile- and without calibration info. That means only profiling and no calibration.
    Is there a way in dispcalGUI? How?

    Yes. Go to the “Calibration” tab, disable “Interactive display adjustment” and set tone curve to “As measured”.

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