Problem with calibration of imac 2020 for DaVinci Resolve

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  • #32665

    dersh
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    Hi everybody. I calibrated my Imac 2020 to bring a clean feed to it. And I ran into a problem. “Clean feed”. For calibration, I used the video preset (recording D65, 1886). Use Mac color display profiles to view – enabled. If I use the mac display as an interface, there will be no artifacts in the shadows, and if as cleanfeed, there will be artifacts. Tell me what calibration settings should I set for proper calibration.

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    #32672

    Vincent
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     Use Mac color display profiles to view – enabled.

    Do not use it, use a LUT3D in software. MacOS color management is extremely limited as only accepts a subset of extremely idealized ICC profiles.

    Also it’s useless to modify gamma if you are going to do what you did = rely on OS provided color management. If you are going to do that, just fix white point (mostly a b* correction)and make grey neutral (which out of the box should be ok on an IPS mac). Any gamma modification will be undone to match content, like intended.

    #32699

    dersh
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    Hello. I made a 3d lut for my Imac. It is being verified. If I do verification, I use the Resolve display in the settings. Then 3d lut does not pass it. In the Davinci settings, I installed 3d lut for the viewer. Tell me, which profile should I install in the Mac os settings? And please tell me further actions or what I’m doing wrong.

    #32708

    Vincent
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    Depending your your LUT3D choice, default ICC for display in OS should or should not have grey calibration (VCGT). If LUT3D has that then OS shoudl not load it, if LUT3D has not that embeded, OS must load it into GPU.

    #32710

    dersh
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    If I use the standard Imac profile, then in the 3D LUT settings I need to check the VCGT box. Tell me please. Will such settings give the correct result? And do I need to do verification using Resolve?

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    #32717

    Vincent
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    Yes, or the opposite keep VCGT globaly, system wide and do not use it in LUT3D. Whatever is easier to you. If you are going to use several color managed apps at the same time as resolve you’ll need to keep VCGT in GPU on OS.

    Also Rec1886 on a limited IPS contrast display is mostly useless for your task. Google Rec 1886 in ITU-R and read its definition.

    • This reply was modified 1 week, 5 days ago by Vincent.
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