P3 to Rec709 with 3D LUT

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  • #39377

    Const24
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    Hello!

    My monitor has gamut coverage larger then sRGB/Rec709. I need create calibration profile and save it as LUT to use in Davinci Resolve.

    For verification I use LightIllusion software always.

    I tryed with a lot of different settings and lose a lot of time how to COMPRESS gamut from larger to smaller.

    All what this software do is moving collors in actual Gammut Coverage (P3 example).

    In LightIllusion we can create profile, 3d lut, verificate it and export LUT for using in DVR.

    HOW I can using DisplayCAL create 3D LUT and see at verfication REC.709 coverage 100% (NOT 111%!!11)

    Please help me, I realy spent a lot of time on all possible settings and attempts for this simple task.

    #39380

    Vincent
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    HOW I can using DisplayCAL create 3D LUT and see at verfication REC.709 coverage 100% (NOT 111%!!11)

    Profile display (create an ICC profile that describe display behavior), then create a LUT3D that maps wahtever you want to simulate (Rec709 g2.4, “SOURCE”) to display colorspace (display profile, “DESTINATION”). Then copy .cube file with LUT3D to Resolve’s folder.
    It’s very straightforward. All these softwares do the same EVEN if they don’t tell you what they are doing. In DisplayCAL you do this step by step.

    • This reply was modified 3 years, 1 month ago by Vincent.
    #39382

    Const24
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    I use “Video 3D LUT for Resolve (D65, Rec. 709)” preset.

    After all steps of callibration and creating 3D LUT, I place LUT in to Davinci, select it in Project Settings, connect via LightIllusion ColourSpace software and verifications show me gummut coverrage much more then Rec709 (111!1!%).
    I need 100% rec.709. When this failed as result I try change foreach parameter. Some change – new callibration (40 min) and repeat, repeat, repeat. At this moment I don’t even care if the calibration is correct, I just want to see Rec709 100% target coverrage as result.

    D65 / Rec .709 /  Gamma 2.4 / 110 nit AND all green dot’s when verificate via ColourSpace. Is it possible to get with DisplayCAL software?

    #39383

    Const24
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    It’s my callibration result with default Video 3D LUT for Resolve (D65, Rec. 709)” preset settings.

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    #39385

    Const24
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    I need just compress it ..,

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    #39387

    Vincent
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    And the problem is…? I think that you do not understand the whole point of each step.

    Display profile MUST have a bigger volume than sRGB/Rec709 IF display is widegamut. A display profile is display behavior. There is nothing wrong in ANY of your screenshots.

    Then you use the LUT3D and get a colorspace mapping from one to another… and that mapping will be only valid in the scope it is been used, Resolve for the few color managed subwindows, or systemwide if you use DWMLUT.
    While the mapping is running and only on the sandbox where it is appied is when you get  Rec709 only.

    I’ll quote myself because I’v already answer you in my 1st message:

    Profile display (create an ICC profile that describe display behavior),

    Step 1 complete (your message), seems OK

    then create a LUT3D that maps wahtever you want to simulate (Rec709 g2.4, “SOURCE”) to display colorspace (display profile, “DESTINATION”).

    Missing step

    Then copy .cube file with LUT3D to Resolve’s folder.

    Missing step.

    It’s very straightforward. All these softwares do the same EVEN if they don’t tell you what they are doing. In DisplayCAL you do this step by step.

    And also…

    I need 100% rec.709. When this failed as result I try change foreach parameter. Some change – new callibration (40 min) and repeat, repeat, repeat. At this moment I don’t even care if the calibration is correct, I just want to see Rec709 100% target coverrage as result.

    That means that you do not understand at all what you’re doing or what a profile is.

    If you are happy cheating yourself on Solitarie, make a “.cube” LUT3D with that custom ICC profile as instructed, then load it in DWMLUT and make sure it is active…. then profile display again… and you get that useless thropy “9x-100% Rec709″…. but it will be useless because you already had it in Resolve window by LUT3D doing.

    #39388

    Const24
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    At this moment I have “result”:

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    #39390

    Const24
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    It’ really compress Gamut coverage (volume?) with 3D LUT

    #39391

    Vincent
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    It’ really compress Gamut coverage (volume?) with 3D LUT

    Yes. Also keep in mind that CIE xy distance on a plot are meaningless because they are not “human distances”.

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