What settings do i use for 3DLUT creation when i want to upload to TV/LG C9

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  • #23651

    A.ces
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    Hey i’m a little unsure what settings to use when creating a 3dlut for uploading to the TV,i see all these settings like rendering intent,source color space, input/output encoding, input/output bitdepth etc, does anyone have any tips what to use, It’s a LG C9.

    #23751

    Florian Höch
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    What do you want to calibrate to? Rec. 709? There’s ready-made presets for it where you just need to change the 3D LUT format.

    #23759

    A.ces
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    What do you want to calibrate to? Rec. 709? There’s ready-made presets for it where you just need to change the 3D LUT format.

    Yeah Rec709 I’m just a little confused at all the options like what bit depth or output/input encoding to use, I get that for full RGB 0-255 should be used but what if I convert to yCbCr limited in the GPU due to banding issues with RGB, do I use 16-235/16-235 or 0-255/16-235, I also read that for the c9 3dlut should be done with 16-255 but I can’t find that option.

    #23774

    Florian Höch
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    The DeviceControl format doesn’t allow choice of encoding, so it will all be set correctly when choosing it.

    #23778

    A.ces
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    The DeviceControl format doesn’t allow choice of encoding, so it will all be set correctly when choosing it.

    Oh I thought LG used the Autodesk format according to the lg c8 thread here.

    #23781

    Florian Höch
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    The two are similar, but not the same. Autodesk has different column ordering so can’t be used with DeviceControl, for example.

    #23946

    A.ces
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    The two are similar, but not the same. Autodesk has different column ordering so can’t be used with DeviceControl, for example.

    So i tried doing a profiling with both auto optimized, and the very large lut testchart, why is the results with auto optimized so much worse?

    The self check is at average:0.31, maximum:8.12 RMS 0.51 while with large lut test chart it’s at: 0.03, maximum 0.86 RMS 0.11

    Left is premade 49xx test chart while right is 49xx auto optimized in picture

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    #24115

    Florian Höch
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    The self-check doesn’t tell you which of the profiles is more accurate, it just tells you which one matches its test set better as a means of diagnosis (anything below avg of 0.5 and peak 5 is fine generally speaking). For testcharts with even distribution of points (“regular grid”), it is expected that the self-check dE is lower than for a perceptually distributed set, but it is not a measure of profile accuracy.

    #24157

    A.ces
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    The self-check doesn’t tell you which of the profiles is more accurate, it just tells you which one matches its test set better as a means of diagnosis (anything below avg of 0.5 and peak 5 is fine generally speaking). For testcharts with even distribution of points (“regular grid”), it is expected that the self-check dE is lower than for a perceptually distributed set, but it is not a measure of profile accuracy.

    If I want to verify my 3DLUT that I made with MadTPG do I just select xxxl video verification chart without using simulation profile? When I did that it reported a bunch of colours with a dE of 2.5-3.5, and a average of 0.5dE is it possible to increase the accuracy of colours to around 0.3dE, and maybe improve the ones that where around 3dE to under 1 dE?

    Or was I doing the verification wrong, and it didn’t use the 3DLUT?

    #24158

    A.ces
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    Update: hmm running the verification with rec709 simulation profile and 3DLUT box ticked, with black output offset 100% 2.4 clearly gives me wrong values as it seems it’s applying the tone curve calibration twice.

    #24159

    A.ces
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    Okay seems im not supposed to use: Use simulation profile as display profile, it mostly gave me correct gamma tracking this way but clearly it went wrong somewhere as grayscale value 55% shows 2.6 gamma, do i need to redo the profiling or the actual calibration as it pretty much follows the calibrated curve if i unselect simulation profile, and verify against icc profile only.

    #24167

    A.ces
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    Hmm there’s still something weird with the some of the yellow colors, i did a second calibration, and profiling i still get high dE in blues, but the yellow colors that report a de of around 0.2-0.4dE clearly looks distinguishable  even if the reported dE says it shouldn’t

    Here’s a HTML report of the verification the yellow patches from around 225ish clearly looks wrong

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