I made a tool for applying 3D LUTs to the Windows desktop

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  • #35520

    dr04e606
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    Guys, I need your help.

    I am a complete noob when it comes to using DisplayCAL and creating 3D LUTs, so, please, bear with me.

    I have a monitor that has a somewhat wider gamut (gamut volume 122.6% of sRGB). I don’t have any measuring device right now, but I have an ICC profile for this monitor that was created for sRGB and which provides a very good accuracy (according to the measuring data from the person that created it with i1Display Pro Plus and to my visual perception). Monitor white point is adjusted to D6500 with monitor OSD settings (R=100, G=99, B=99) and not the ICC.

    What I’m trying to achieve right now is to create a 3D LUT for DwmLutGUI from this ICC profile that will effectively clamp this monitor’s gamut to sRGB system-wide. The computer that I will be using it on has an Intel GPU, so I can’t use Novideo_sRGB which worked very well with this monitor on another computer. I know that this can seem a bit ridiculous as I won’t be able to verify the accuracy of created 3D LUT with any measuring device…  I just want to make sure that I’m applying the right settings while creating it in 3DLUT-maker (with your help).

    • This reply was modified 4 weeks ago by dr04e606.
    • This reply was modified 4 weeks ago by dr04e606.
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    #35524

    dr04e606
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    I can’t edit my previous posting anymore for some reason…

    Here’s an ICC profile that I’m using for LUT creation. I’ll leave it here just i case.

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    #35527

    Vincent
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    You can’t and you shouldn’t. Even if your sRGB mode has thr same colorimetric response as that other person’s monitor… sRGB mode has not the same response as custom/user mode even in the same monitor.

    Use DWMLUT with destination colorspace equal to driver ICC / EDID ICC.

    if you wish to test your WRONG approach:
    -extract VCGT from that other person ICC into a cal file woth DispalyCAL curve viewer or profile info or something like that into a .CAL file
    -embed .cal data with ArgyllCMS command line intoa copy of driver/EDID ICC (applycal.exe or other tool, read documentation)
    -use that profile in LUT3D creator with embed VCGT
    -aply that LUT3D to DWMLUT

    #35528

    Vincent
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    iccvcgt.exe tool

    #35529

    dr04e606
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    Thanks for the reply!

    Use DWMLUT with destination colorspace equal to driver ICC / EDID ICC.

    Should I be using the same settings in 3DLUT-maker as before (see the screenshot above) and only change the destination profile from the custom one (created with i1Display Pro Plus) to the generic one (driver ICC)?

    #35530

    dr04e606
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    Apparently, this monitor doesn’t have drivers (and ICC profile). I can’t find anything like that nither on the manufacturer’s website nor in the box. I guess I need to learn how to generate an ICC profile from EDID data. If it’s possible at all.

    Interestingly enough when I set gamma to 2.2 I get a much more consistent and visually pleasing picture in darker areas, as opposed to applying black output offset (100%) which makes the first 15 patches look greyish and lack distinct variation between them. Whereas 2.2 results in gradual steps from absolute black to very dark grey.

    Overall, so far, I’m very pleased with the color output that DWM LUT provides with these settings (even though they might be wrong according to Vincent). I never saw a “calibrated” monitor with such smooth gradients.

    Performance impact in games is huge though. In Trackmania Nations Forever with LUT applied I get around 120 fps with inconsistent frametime (slight stuttering), whereas without it I get over 200 fps and a much more consistent frametime.

    #35533

    MW
    Participant
    • Online

    Interestingly enough when I set gamma to 2.2 I get a much more consistent and visually pleasing picture in darker areas, as opposed to applying black output offset (100%)

    The difference is that the 2nd setting uses sRGB TRC which a lot of users find washed out. Both are using BOO 100%.

    It’s not worth paying too much attention to the Lagom black test. It’s basically flawed and you can rightfully put more value in how you perceive real content.

    #35534

    S Simeonov
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    Do we still need displaycal profile loader when using dwmlut?

    #35535

    Vincent
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    Do we still need displaycal profile loader when using dwmlut?

    He is not using as destination colorspace actual display colorspace (a profile from measurements) … hence all his complains comes from guessing a lot of things and manipulating source colorspace TRC instead of trying different sinthetic profiles with different TRCs as destination that would match actual display behavior.

    • This reply was modified 3 weeks, 5 days ago by Vincent.
    #35537

    Vincent
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    @dr04e606 : profile from EDID data (trusting it to be accurate) can be generated from File menu, create profile from Extended Display Information Data.

    #35538

    S Simeonov
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    Do we still need displaycal profile loader when using dwmlut?

    He is not using as destination colorspace actual display colorspace (a profile from measurements) … hence all his complains comes from guessing a lot of things and manipulating source colorspace TRC instead of trying different sinthetic profiles with different TRCs as destination that would match actual display behavior.

    So, do we need it or not?

    #35539

    Vincent
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    Do we still need displaycal profile loader when using dwmlut?

    He is not using as destination colorspace actual display colorspace (a profile from measurements) … hence all his complains comes from guessing a lot of things and manipulating source colorspace TRC instead of trying different sinthetic profiles with different TRCs as destination that would match actual display behavior.

    So, do we need it or not?

    Both.

    Did you embed VCGT in LUT3D calculation?  yes => no loader, no => use loader

    Since in his example it has a (wrong) VCGT he want to try, he can test the 2 ways.
    For the 1st one he would need to embed that VCGT into a synth/EDID profile with native gamut primaries he can use as destination colorspace.
    For the 2nd one Photoshop & color managed apps won’t work properly if he uses an ICC made for sRGB mode on a native gamut OSD configuration.

    • This reply was modified 3 weeks, 5 days ago by Vincent.
    • This reply was modified 3 weeks, 5 days ago by Vincent.
    • This reply was modified 3 weeks, 5 days ago by Vincent.
    #35651

    calibrovkin nikola
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    @Vincent , Hello. With the latest windows 11 update, the dwmlut program stopped working. Lut does not work.  Thanks

    #35652

    Vincent
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    @Vincent , Hello. With the latest windows 11 update, the dwmlut program stopped working. Lut does not work.  Thanks

    Ask LeDoge/DogeLition, DWMLUT is his work.

    Also check latest release

    https://github.com/ledoge/dwm_lut

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