Dell U2720Q | Calibration

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  • #145078

    Alessio Perisano
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    Hello everyone,
    I need to do some color grading with Resolve for a short documentary.
    I’ve calibrated it 16 times, but each time it gives me different measurements, sometimes decent, sometimes completely off.
    I really don’t understand anything anymore.
    I’d like someone to tell me the settings, because I really don’t understand.

    Here’s the information to start with:
    – Monitor connected to Resolve via DeckLink 4K monitor
    – ArgyiiCMS 3.4.1 (although I don’t know if it’s installed correctly)
    – xrite i1 display

    Please help me, I’ve been doing these calibrations for days…
    I’m attaching the latest one I did, with the settings.

    Thank you so much

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    #145088

    DaniJ
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    Report shows display is in its native gamut while the app expects Rec709. Did you enable the LUT when measuring the report? It’s not active.

    • This reply was modified 7 months, 1 week ago by DaniJ.
    #145090

    Alessio Perisano
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    Thanks for the prompt reply.

    Forgive me, but I don’t think I understand. What does it mean if I enabled the LUT during the test?
    Did you notice anything wrong with the settings?
    On this site, it suggests setting everything to native in the calibration section, while I entered the precise values ​​for Rec 709 2.4.

    What am I doing wrong? 🙁

    #145091

    DaniJ
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    You’re using Resolve and you created a 3D LUT. Did you load the 3D LUT into Resolve?

    #145092

    Alessio Perisano
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    Of course, I loaded the LUT in resolution, that’s not the problem, but the fact that the calibration takes me to 135% in SRGB, a maximum of 1.8 to 2.0, and when I check it, it comes out wrong.

    So I’m definitely doing something wrong in the settings, for example, black offset, relative or absolute in the gamma, black and white compensation, in short, there are some checkboxes that I still haven’t figured out what they’re for.

    #145093

    Vincent
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    Of course, I loaded the LUT in resolution, that’s not the problem, but the fact that the calibration takes me to 135% in SRGB, a maximum of 1.8 to 2.0, and when I check it, it comes out wrong.

    You are making a verification trough a device link, so your settings for verification are wrong. Becasue if you trully had such LUT3D loaded it will be applied twice, once as LUT3D in resolve then as a devicelink, resulting on a desaturation.

    So I’m definitely doing something wrong in the settings, for example, black offset, relative or absolute in the gamma, black and white compensation, in short, there are some checkboxes that I still haven’t figured out what they’re for.

    No, or not in that place because the items you named have zero relation with gamut boundaries.

    So it seems that LUT3D is doing nothing. Create it manually using LUT3D creator in display cal folder (there is an exe to do that) and redo the process.
    A verification through regular display output and device link shuld give you ~rec709. Also verification through resolve with LUT3D applied and no device link should get you ~rec709.

    If you are inexperencied using this kind LUT3D for calibration, get a Rec709 100% saturation green and red MP4 files and import them to your project. If you see P3 green or P3 red instead of sRGB green/red, your LUT3D setup in Resolve is wrong. You can spot this by your own eyes without measurements.
    AVSForum had  a catalog of these Rec709 video level  100% saturation test patches but I do not remember the thread.

    • This reply was modified 7 months, 1 week ago by Vincent.
    #145095

    Alessio Perisano
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    You are making a verification trough a device link, so your settings for verification are wrong. Becasue if you trully had such LUT3D loaded it will be applied twice, once as LUT3D in resolve then as a devicelink, resulting on a desaturation.

    Sorry, I don’t quite understand what you’re referring to. What does it mean to check via connection?
    I’m doing what everyone else is doing, what everyone shows on the internet.
    Of course, when I calibrate and check, I do it without any LUTs enabled in RESOLVE, so I don’t understand what you’re referring to, and forgive me.

    Do I need to load the LUT in resolve before doing the measurement/check?

    <font dir=”auto” style=”vertical-align: inherit;”><font dir=”auto” style=”vertical-align: inherit;”>No, o almeno non in quel posto perché gli elementi che hai nominato non hanno alcuna relazione con i confini della gamma.</font></font>
    <font dir=”auto” style=”vertical-align: inherit;”><font dir=”auto” style=”vertical-align: inherit;”>Sembra che LUT3D non stia facendo nulla. Createlo manualmente usando LUT3D Creator nella cartella Display CAL (esiste un file .exe per farlo) e ripetete il processo. </font></font><br><font dir=”auto” style=”vertical-align: inherit;”><font dir=”auto” style=”vertical-align: inherit;”>
    Una verifica tramite output di visualizzazione standard e collegamento al dispositivo dovrebbe restituire ~rec709. Anche una verifica tramite resolver con LUT3D applicato e nessun collegamento al dispositivo dovrebbe restituire ~rec709.</font></font>

    I don’t understand what you’re referring to here either; you’ll have to excuse me.
    What do you mean the LUT3D isn’t doing anything?
    Maybe it’s best to start from scratch.
    Are the settings correct using the DISPLAYCAL images, considering my monitor, and my colorimeter connected to the DeckLink 4K?

    Thank you very much for your patience:)

    #145096

    Alessio Perisano
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    Are you telling me that before I can verify, I need to load the LUT into Resolve?

    #145097

    Vincent
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    Are you telling me that before I can verify, I need to load the LUT into Resolve?

    An ICC device link is equivalent to a LUT3D, take color data in some colorspace and reencode it in another. Same color coords bu dfferent RGB numbers.

    So for verifying you can leave Resolve with no LUT3D and use a device link, or apply a LUT3D in resolve and do not use a device link.
    (or you can use regular GPU desktop output and a device link)

    But “for working” you need to load LUT3D in Resolve, otherwise Resolve for Windows will expect that your display matches content.
    Project settings\ color management and then “video monitor” and “color viewer look up table”

    #145098

    Vincent
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    What do you mean the LUT3D isn’t doing anything?

    You applied an ICC device link through Resolve output… but it shows near P3 gamut, not Rec709. Hence LUT3D (here using its ICC device link version) is doing nothing.

    So open DisplayCAL-3DLUT-maker.exe, source is Rec709, destination is your custom profile, create LUT3D in the desired format, then load it into Resolve (my previous post)

    Also as explained before better get a 100% saturation green Rec709 sample file. If you load it into Resolve an looks oversaturated in timeline output or main output (EDIT / CUT / COLOR), there is not LUT3D.
    Keep in mind that thumbnails are not color managed so master thumbnails and timeline thumbnails will look oversaturated even if you have properly configured the LUT3D.
    A sample test file with 100% saturation green in sRGB/Rec709 (be it a image or a video) will help you check visually if color management is working properly without expending time in measurements.

    • This reply was modified 7 months, 1 week ago by Vincent.
    #145100

    Alessio Perisano
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    Are the displayCAL settings correct?

    I redid the measurement and now it works, I didn’t change anything in the settings

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    #145102

    Vincent
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    Verification is working now, Resolve (for doing your work) is likely not. Read previous messages.

    #145103

    Alessio Perisano
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    yes, but are the settings in displaycal correct?

    #145104

    Vincent
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    Are you telling me that before I can verify, I need to load the LUT into Resolve?

    An ICC device link is equivalent to a LUT3D, take color data in some colorspace and reencode it in another. Same color coords bu dfferent RGB numbers.

    So for verifying you can leave Resolve with no LUT3D and use a device link, or apply a LUT3D in resolve and do not use a device link.
    (or you can use regular GPU desktop output and a device link)

    But “for working” you need to load LUT3D in Resolve, otherwise Resolve for Windows will expect that your display matches content.
    Project settings\ color management and then “video monitor” and “color viewer look up table”

    I do not know how any times I’ll need to write it.

    #145105

    Alessio Perisano
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    I’ve already read your answers, but I don’t understand why it’s so difficult to answer my question.

    I’m asking if the displaycal settings are correct.

    I honestly didn’t understand anything you said. I don’t know if we’re talking about the same thing. I don’t understand what you’re referring to when you mention device link, because you tell me not to use it, and then recommend using the GPU output.

    You tell me that I need to load the LUT in resolve to work, but I know I need to load it in resolve, I already do that and know how to load it, so I don’t understand what you’re referring to.

    I’m really sorry if I’m wasting your time, but it’s not clear to me if we’re talking about the same thing. I’m asking a question, but it seems like the answer is something else.

    :(:(

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