ASUS PA32UCX -3D LUT

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  • #30776

    Ramahi
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    Hi everyone. Its my 1st time calibrating a monitor and i’m stuck with something that i cant seem to understand.

    i started a calibration process and i created a 3D LUT. How can i upload that LUT to the monitor?
    maybe I’m missing something. But i’m sure my monitor accepts 3D LUT

    thanks in advance

    #30780

    Vincent
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    You need vendor propietary SDK to upload calibrations to monitor. ArgyllCMS/DisplayCAL do not provide that functionality

    #30791

    Ramahi
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    Thanks for explaining Vincent,

    any easy SDK you know about?

    #30792

    Vincent
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    The one Asus licensed to LightIllusion… so you have to pay their software to upload calibrations. AFAIK there is no public SDK.

    #30795

    Ramahi
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    I did buy it but i canceled it cause its only windows version.

    ok 1 more question if you know the answer to.

    i calibrated and let Davinci handle the LUT. Does it have the same outcome as uploading to the monitor directly?

    #30796

    Vincent
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    i calibrated and let Davinci handle the LUT. Does it have the same outcome as uploading to the monitor directly?

    Yes, as long as monitor is well behaved for such lut node size (and it should).

    Run a verification report to check all is in place and load a grey gradient into resolve to spot banding.

    As explained in other threads if you run a verification report through resolve where LUT3D is loaded, use simulation profile to your target and use simulation profile as display profile but do not use device link (equivalent to LUT3D) bacuse you’ll aply it twice.
    In the same way you may want to verify (GUI monitors) if device link in default desktop in your OS (monitor through common GPU) is a good LUT3D. In this situation you must choose device link too in measurement report since LUT3D (equivalent to) is going to be applied on desktop patches (it won’t go through resolve, just OS desktop).

    • This reply was modified 3 months, 2 weeks ago by Vincent.
    • This reply was modified 3 months, 2 weeks ago by Vincent.
    #30802

    Ramahi
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    Thats a very useful info thank you so much Vincent.

    if you refer me to the explanation post you talked about it would be much appreciated!

    Thanks again!

    #30857

    AstralStorm
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    There’s no reason to calibrate that screen whatsoever, as it’s accurately calibrated out of the factory, especially in SDR.

    Maybe something could be had in HDR mode, but calibrating that will be extra tricky.

    Profiling, on the other hand, could be useful, as would emulation 3DLUTs for Resolve or mapping ones for games.

    • This reply was modified 3 months, 1 week ago by AstralStorm.
    #30859

    Vincent
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    There’s no reason to calibrate that screen whatsoever, as it’s accurately calibrated out of the factory, especially in SDR.

    No, unless proven with measurements on a statistically big sample.

    Profiling, on the other hand, could be useful, as would emulation 3DLUTs for Resolve or mapping ones for games.

    Your sentence means that is is not calibrated accuratelly on SDR, otherwise it would match a matrix profile colorspace without issue <very low dE

    #30860

    Vincent
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    BTW unfortunatelly guys at prad.de measured it with i1d3 corrected with RGBLED whie actually its like a low cost SW2700PT (a QLED like the one used in other Asus PG gaming series)
    That means that although prad.de shows WP calibration off in CCT and in pink-green tint, and gamma is a little off, we cannot know for sure.

    • This reply was modified 3 months, 1 week ago by Vincent.
    #30868

    AstralStorm
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    That is rather concerning, since the screen comes with a valid calibration certificate for SDR.

    Matrix is insufficient for emulating gamma curves – you need matrix plus curve. Profiling is theoretically optional if you want to either run the emulation in HDR PQ mode and risk the backlight, or the SDR sRGB is convertible well enough (with good contrast) to gamma you want; but you still need to measure actual screen primaries, they’re not 100% matching reference samples. Whitepoint is nearly perfectly accurate D65 with minor delta towards blue near black as typical for LCDs.

    That said, the screen LUTs extremely well in wide gamut SDR mode to anything you may want with a full profile. Like <0.5 dE well.

    Personally, I would trust tftcentral with their Klein and i1Pro2 over prad.de, and I’ve seen two of those screens. They both were <1 dE in sRGB mode, a third one was <2 dE. The wide gamut is also excellent, even close enough to BT.2020 to do <3 dE even with the insufficient gamut.

    Of course it is possible there may exist manufacturing fail samples.

    • This reply was modified 3 months, 1 week ago by AstralStorm.
    • This reply was modified 3 months, 1 week ago by AstralStorm.
    • This reply was modified 3 months, 1 week ago by AstralStorm.
    • This reply was modified 3 months, 1 week ago by AstralStorm.

    i1Basic Pro 2 on Amazon  
    Disclosure: As an Amazon Associate I earn from qualifying purchases.

    #30873

    AstralStorm
    Participant
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    *UPRTek now, even better.

    #30874

    AstralStorm
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    3DLUT is needed if you want anything in HDR that is not straight PQ, as the backlight (and thus gamma) behaves a bit wrong if you just give it BT.2390 curve for example or use HLG mode.

    • This reply was modified 3 months, 1 week ago by AstralStorm.
    #30876

    Vincent
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    That is rather concerning, since the screen comes with a valid calibration certificate for SDR.

    That means nothing. Dell an Benq have those useless papers too and asus is waaaay worse in QC than them.

    That said, the screen LUTs extremely well in wide gamut SDR mode to anything you may want with a full profile. Like <0.5 dE well.

    No proof of that.

    Personally, I would trust tftcentral with their Klein and i1Pro2 over prad.de, and I’ve seen two of those screens. They both were <1 dE in sRGB mode, a third one was <2 dE. The wide gamut is also excellent, even close enough to BT.2020 to do <3 dE even with the insufficient gamut.

    No proof of your claims

    Hint: it’s not about the LUTs, it’s about the panel, about QC which is non existent in Asus.

    ALL -A-L-L- of these widegamut monitors (Eizo, NEC, Dell, LG Benq, Asus…) can calibrate greyscale perfectly, it’s a 1D 1024 entry for grey + LUT3d/matrix for colorspace emulation.  It’s about QC & time spent calibrating them  = number of patches used for calibration.
    The lesser the number of patches the more well behaved panel needs to be to keep errors uncer certaint mark. Worse behaved panels need more patches.
    That is the very reason ArgyllCMS (12+24+48+96 x channel) can correct grey on those lowcost widegamuts while their HW calibration solutions provided by vendor cannot do that on some (high % of units) because of low patch number (10 maybe 20, maybe a llittle more x WRGB).

    Since prad.de shows >3dC even with UC on… Asus has NO QC at all but measured unit have very good grey range (well behaved gamma, bad color uniformity).

    #30881

    AstralStorm
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    Very weird then that I have seen personally 3 units and they were all matching well calibrated. Way different SN too. Should I whip out my probe and drop you a measurement?

    Of course it is possible that prad.de just got a lemon. It happened to me too with another monitor. Lemons are easily seen with naked eye with color gradient patterns, such as on lagom.
    They are even sometimes correct panels out of factory, but something goes wrong with assembly. (according to my aunt at a factory – they are forced to sell these lemons, they make TVs)

    • This reply was modified 3 months, 1 week ago by AstralStorm.
    • This reply was modified 3 months, 1 week ago by AstralStorm.
    • This reply was modified 3 months, 1 week ago by AstralStorm.
    • This reply was modified 3 months, 1 week ago by AstralStorm.
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