MadVR 3DLUT causing artifacts.

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  • #7093

    Sean Willis
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    This issue arose out of nowhere it seems for me. I was using an existing 3dlut file and it looked great but all the sudden it started to look like the image I attached.

    I have done multiple calibrations since but its always the same. I am not sure what I am doing wrong.

    • This topic was modified 6 years, 10 months ago by Sean Willis.
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    #7098

    Florian Höch
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    Please post the original image as well, I do not know what to look for.

    #7103

    Sean Willis
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    Here is the same scene with 3dlut off

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    #7106

    Florian Höch
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    Your result is much darker. What settings have you used? Please attach the profile.

    #7108

    Sean Willis
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    I have a 4k LG EF900 OLED TV.

    NVIDIA is set to RGB 8bpc Limited

    I have White level drift compensation on, and correction set to auto. I have tried setting correction to OLED but it hasn’t made a difference that I can tell.

    Calibration and profiling tab is to default settings under Video 3D LUT for MadVR

    3D LUT Tab settings are below in the attached picture.

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    #7121

    Florian Höch
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    That’s the 3D LUT, but I can already see from it that your measurements have been totally botched, probably due to OLED auto-dimming. Have you used white level drift compensation?

    #7122

    Sean Willis
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    Yes I have white level drift compensation option checked. Also I have turned off the autodimming via the service menu from the TV so I don’t think its that.

    #7123

    Florian Höch
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    I can tell you with 100% certainty that your TV’s light output is not even remotely stable over time. It has absolutely insane brightness fluctuations. You need to get rid of those, otherwise there is zero chance that you will be able to accurately profile this TV.

    #7126

    Sean Willis
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    Should I not have the test window maximized? Could that be the issue? Also Its the same result if I do 1500 patches or 73 so I really don’t understand how it could be fluctuating that much in a 4 minute span

    #7129

    Florian Höch
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    Should I not have the test window maximized? Could that be the issue?

    That could well be it. OLEDs limit maximum brightness of full fields, much like Plasmas do. I would advise making the patch window as small as possible (while still fitting the instrument) and using a black background for OLED.

    Also Its the same result if I do 1500 patches or 73 so I really don’t understand how it could be fluctuating that much in a 4 minute span

    It’s not all that surprising, the fluctuation happens because of what’s displayed, so time plays less of a role.

    #7131

    Sean Willis
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    Here is the profile I just made. But it is causing a different set of issues. As you can see below from the first two images.

    And then I made a separate 3dlut via the settings for madvr and its completely crazy as you can see from the 3rd image.

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    #7137

    Florian Höch
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    These results look like the measurements were botched again. Please attach the profiles as well, the files you attached are the 3D LUTs.

    #7139

    Sean Willis
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    What is the file extension you are looking for?

    #7140

    Sean Willis
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    I didn’t see you could send it to a compressed file.

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    #7143

    Florian Höch
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    Ok thanks. The first profile (DENON-AVR-2-2017-05-21-13-48-0.3127x-0.329y-S-XYZLUT) actually looks fine, but the gamut is limited to slightly below Rec. 709. For 3D LUT use, I always recommend to profile in the native (usually the widest) gamut mode available via your TV’s settings, so that any in-TV color management is disabled (so that it doesn’t distort anything) and the 3D LUT has the native color gamut of the TV to work with.

    The second set of measurements has significantly raised blacks (0.37 cd/m2), not sure what was going on there.

    My recommendation is to re-profile in wide (native) gamut mode, using the same patch set as for the first profile. This is likely going to resolve your issues.

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