Indicators of a good calibration?

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  • #610

    anonymous SourceForge
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    Greetings,

    I have a QNIX QX2710LED monitor and I do love it. However, I knew from day
    1 that something was off as lights and reflections in games or movies were
    being over exaggerated. So much so that some armor in Skyrim was cause
    like a pure white brightness that just washed out everything around it. It
    was like HDR bloom effect on everything.

    Well, I spent a lot of time researching this and no too much info could be
    found on this subject but it did lead me to the world of color management
    and ICC profiles. I feel to this date I have tried almost every available
    ICC profile on the net (TFTcentral and other places) with little or no help
    to correct this issue.

    I FINALLY broke down and purchased the Colormunki DISPLAY just last week!
    I have spent too much time on this problem now that I HAVE to find a
    solution. I’ve also read that the manufacture’s software that comes with
    the DISPLAY was not that great and that DispcalGUI and Argyll were a much
    better option.

    I have done several different calibrations to get familiar with the
    software and now I’m trying to interpret the results I’m getting. I use
    this monitor for gaming and video/picture production and my goals are to
    make sure my colors are the best they can be and that this “GLOW” problem
    is eliminated or identified.

    My initial results were this monitor had been operating at a color
    temperature of ~8500k and this could possible be the reason for the
    credulous lights and reflections I was seeing. I have made sure all
    calibrations now are set to 6500k white point but now somethings else has
    started to happen.

    I don’t know if the whites I now see with these calibrated 6500k ICC
    profiles are correct or my eyes are now “used” to looking at something
    else. With the new ICC profiles with White point set to 6500k the whites
    to me look almost grayish and pink? I can’t really explain it. So now I
    feel I can’t trust my eyes when looking at this monitor or calibrations.

    How can I just interpret the results of my profiling and calibrations and
    not have to rely on my eye differentiating the whitepoint. I think I eyes
    might have become accustomed to the 8500k color temperature and now it’s
    just playing tricks on me.

    TL;DR I have a QNIX and from day 1 noticed that objects that have light or
    reflections on the monitor are over saturated. Just got Colormunki DISPLAY
    and using dispcal to create ICC profiles with WP to 6500k and it looks
    weird to me. How do I know it’s IN FACT correctly calibrated by
    interpreting the measurement report?

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    #611

    Florian Höch
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    So much so that some armor in Skyrim was cause
    like a pure white brightness that just washed out everything around it. It
    was like HDR bloom effect on everything.

    Sure it’s not bloom? Games are not good for testing this, you should use a test image where it is 100% known how it should look like.

    How do I know it’s IN FACT correctly calibrated by
    interpreting the measurement report?

    After calibration / profiling, go to the “Verification” tab and choose one of the bigger verification charts (e.g. “Large verification testchart”). After running the report measurements, average dE should ideally be below 1 and max below 4.

    #612

    anonymous SourceForge
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    Thank you for your reply. Yes I am 100% this is not bloom effect as this visual anomaly happens in games, internet images, some videos on youtube. Good news is that its been a few days on this 6500k color temperature and it seems more natural. I think I have just normalized 8500k in my mind.

    Is there anything I can post for my results to be peer reviewed? The output measurement data is very nice but not easy to share. below is my summary.

    Basic Information

    Device: 1179 @ 0, 0, 2560×1440
    Instrument: i1 DisplayPro, ColorMunki Display — LCD (generic)
    Correction: LCD White LED IPS (WLED AC LG Samsung) <WLEDFamily_07Feb11.ccss>
    Target profile: 1179 2015-05-23 D6500 2.2 M-S XYZLUT+MTX
    Profile whitepoint XYZ (normalized): 149.92 157.79 171.28 (95.01 100 108.55), CCT = 6485K
    Measured luminance: 158 cd/m²
    Measured whitepoint XYZ (normalized): 150.1 157.95 171.4 (95.03 100 108.51), CCT = 6481K
    Assumed target whitepoint (XYZ): 6500K daylight (95.02 100 108.77)
    Measured black luminance: 0.194 cd/m²
    Contrast: 814.3:1
    Testchart: verify_extended.ti1
    Simulation profile: None
    Gamma mapping: N/A
    Whitepoint simulation: No
    Chromatic adaption: Bradford
    Devicelink profile: None
    Evaluation criteria: RGB
    Date: 2015-05-23 23:57:46
    Summary

    Criteria Nominal Recommended # Actual Result
    Measured vs. assumed target whitepoint ΔE*00 <= 2 <= 1

        0.09
    

    OK ✔✔
    Average ΔE*00 <= 1.5 <= 1

        0.13
    

    OK ✔✔
    Maximum ΔE*00 <= 4 <= 3
    14

    0.38

    OK ✔✔
    ✔ Nominal tolerance passed
    ✔ Recommended tolerance passed

    #613

    Florian Höch
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    The output measurement data is very nice but not easy to share.

    It’s an HTML file, you can just attach it to your post.

    #614

    anonymous SourceForge
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    here is the newest one. I am going to try for an extended calibration and profiling tonight when it’s dark. I tried 120 cd/m2 and thought it was just a little too dark for my personal preference. Might try 140-150 . I really don’t know enough to experiment outside of the presets within Dispcalgui right now, think the web & office would be ideal for me? Also, which it better when calibrating for color temperature 6500k or D65? From what I can tell this is the difference between daylight and blackbody. I don’t know how these differ on a w-LED.

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    #616

    Florian Höch
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    here is the newest one.

    Looking good, ideally you’d run one of the larger verification charts though.

    I tried 120 cd/m2 and thought it was just a little too dark for my personal preference.

    The brightness you should aim for depends on the ambient light level. It’s perfectly fine to not set a brightness target and adjust the brightness purely visually during interactive display adjustment (make the measurement window as large as possible during this so you can look at the white and see if it’s too dim or too bright. Afterwards, cancel out and set the measurement window to a smaller size again).

    I really don’t know enough to experiment outside of the presets within Dispcalgui right now

    That’s fine, the application is designed in such a way that you should be able get very good results via one of the presets, without much need to change anything.

    think the web & office would be ideal for me?

    Yes, this is the go-to preset if you’re unsure (that or the defaults).

    Also, which it better when calibrating for color temperature 6500k or D65?

    D65 is roughly 6504K.

    From what I can tell this is the difference between daylight and blackbody.

    The difference is often negligible, but daylight is normally the correct choice.

    • This reply was modified on 2015-05-26 00:57:45 by fhoech.
    #617

    anonymous SourceForge
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    Here is my newest profile and calibration with extended and low settings. So, I hope I am doing the bet that I can. From this, does everything look ok?

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    #619

    anonymous SourceForge
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    Keep in mind that monitors like this QNIX have no OSD/internal electronics to fix White point at monitor, white should be corrected at graphics card LUT, so you ended with 88% grey values: big amount to correct WP (blue) and certain amount to fix gamma and grey neutrality. Depending on your graphics card this setup may look awful (nvidia).

    Also lots of games clear graphics card LUT at start. Please, measure your QNIX native gamma behaviour, maybe it’s what you see in games (tools->measurement report->validate against Rec709_2.2gamam.icm or srGB.icm as simulation & target profiles). A low value in gamma near white may point a problem like yours.
    I think there is an application for windows to prevent games messing up with GPU LUTs (clearing it), it’s called “ColorSustainer” or something like that (google) which has higbitdepth LUT loader like ArgyllCMS/DispcalGUI so if you have an AMD graphics card you won’t experience banding even with a severe white point correction in GPU LUTs.

    Finally, games are not color managed and QNIX and other WLEDs with 99-100% sRGB coverage have a gamut slightly bigger in volume than sRGB. Blue outside sRGB, red outside sRGB, and red usually “moved” a little in xyY 2D coords towards yellow-lime. So non color managed apps may look a little oversaturated: orange color for example.

    #620

    anonymous SourceForge
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    If I run games in windowed boarder less then the ICC profile that is current is applied to the game. I also do use color sustainer but, unless i’m changing the monitors refresh rate, windows does a pretty good job enforcing the only profile I want active anyways. The extended profiling I accomplished seems really nice. I need more time with it to make a full judgment.

    #621

    Florian Höch
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    If I run games in windowed boarder less then the ICC profile that is current is applied to the game.

    No, it’s only the calibration that’s having an effect, games generally do not make use of color management.

    #622

    anonymous SourceForge
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    But, my glare effect has been eliminated since using a color temperature of 6500k and now after the extended test, it looks even better. :/ Either way my problem has been resolved

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