Verification Settings

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  • #3528

    Michael
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    I’m calibrating a Samsung KU7000 UHD TV as a PC monitor.  I’m calibrating it with a white point of 6500° Kelvin, a white level of 100 cd/m^2, and the sRGB tone curve.  With the TV in PC mode, with all contrast enhancements and such turned off, DisplayCal is able to run calibration, and the results look great.

    My only question involves the Verification report.  Using the Extended Verification test chart, if I leave the Simulation Profile checked, the report says my calibration is way off.  If I turn off the Simulation Profile, the report looks much better – everything comes up in the green, in fact.

    Am I supposed to turn this off, and if so, why?  There is so much about color calibration I don’t understand, and I’m messing with DisplayCal to learn.  Some explanation as to which calibration method, and Verification settings I should be using would be helpful.

    #3532

    Florian Höch
    Administrator
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    My only question involves the Verification report. Using the Extended Verification test chart, if I leave the Simulation Profile checked, the report says my calibration is way off.

    Make sure “Use simulation profile as target” is not enabled.

    Some explanation as to which calibration method, and Verification settings I should be using would be helpful.

    The settings you used are fine for use of the TV as PC monitor. Verification is detailed in great depth in the documentation.

    #3533

    Michael
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    I read everything about verification I could find in the documentation, but I still couldn’t understand what the “Use simulation profile as target” setting was all about, nor could I determine whether it should be enabled or not.  That’s why I asked.  But, if you say it should not be enabled, that’s good enough for me.  Thanks.

    #3534

    Florian Höch
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    I still couldn’t understand what the “Use simulation profile as target” setting was all about

    This setting is only useful in a scenario where a display is adjusted to match the selected simulation target without ICC color management, i.e. by using the display controls, an external 3D LUT box or similar.

    #3535

    Michael
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    I still couldn’t understand what the “Use simulation profile as target” setting was all about

    This setting is only useful in a scenario where a display is adjusted to match the selected simulation target without ICC color management, i.e. by using the display controls, an external 3D LUT box or similar.

    Oh, I understand.  Thanks for taking the time to explain!

    #3537

    Michael
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    Setting the white point and white level to “as measured”, and the tone curve to sRGB, I got the attached verification results on a Samsung KU7000 TV, being used as a computer monitor. They seem very good to me. The only glitch I see is the gamma a tiny bit off at 95% luminance, but I’m guessing that that isn’t visible. In an effort to learn, I would like to figure out what’s causing that…

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    #3540

    Florian Höch
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    The only glitch I see is the gamma a tiny bit off at 95% luminance, but I’m guessing that that isn’t visible. In an effort to learn, I would like to figure out what’s causing that…

    It is normal for gamma to fluctuate more at the extremes, because near white and black, a comparatively small change in luminance leads to a comparatively large change in gamma. The visual significance of this is negligible, though.

    #3541

    Michael
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    The only glitch I see is the gamma a tiny bit off at 95% luminance, but I’m guessing that that isn’t visible. In an effort to learn, I would like to figure out what’s causing that…

    It is normal for gamma to fluctuate more at the extremes, because near white and black, a comparatively small change in luminance leads to a comparatively large change in gamma. The visual significance of this is negligible, though.

    Thanks Florian,

    I figured that slight gamma error was insignificant.  And I don’t do critical color work, and don’t need a perfectly calibrated display.  I’m just doing this to occupy my time, and learn something new.  I’m really enjoying your program.  Thanks again…

    #3545

    Michael
    Participant
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    The only glitch I see is the gamma a tiny bit off at 95% luminance, but I’m guessing that that isn’t visible. In an effort to learn, I would like to figure out what’s causing that…

    It is normal for gamma to fluctuate more at the extremes, because near white and black, a comparatively small change in luminance leads to a comparatively large change in gamma. The visual significance of this is negligible, though.

    Florian, is there an easy way to run that same verification report without a color profile active?  It would be nice to be able to compare a display before and after calibration.  Thanks…

    #3547

    Florian Höch
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    Florian, is there an easy way to run that same verification report without a color profile active?

    “Use simulation profile as target” can be used for that.

    #3548

    Michael
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    So, just so I’m sure I understand…  If I select “Use simulation profile as target”, and chose the sRGB profile, my monitor will be tested, uncalibrated, against the sRGB standard instead of my calibration profile?  Now I think I see how that function works!  Thanks!

    #3549

    Florian Höch
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    If I select “Use simulation profile as target”, and chose the sRGB profile, my monitor will be tested, uncalibrated, against the sRGB standard instead of my calibration profile?

    Yes.

    #3550

    Michael
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    Excellent.  Thank you!

    #14822

    Bela Pesics
    Participant
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    I still couldn’t understand what the “Use simulation profile as target” setting was all about

    This setting is only useful in a scenario where a display is adjusted to match the selected simulation target without ICC color management, i.e. by using the display controls, an external 3D LUT box or similar.

    So the 1D LUT is also disabled in that case?

    #14826

    Florian Höch
    Administrator
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    Yes.

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