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Gabriel36933880ws14
Participant
April 23, 2024
Answered

Auto Detect Log not working for C-Log 3

  • April 23, 2024
  • 8 replies
  • 2523 views

In Premier Pro 24.3.0 on my M1 MacBook Air Auto Detect Log Video Color Space is not working for my C-Log 3 footage. I went into Lumentri Color > Settings > Project > Auto Detect Log Video Color Space and it did not work. I also went to File > Project Settings > Color > Auto Detect Log Video Color Space and it still did not work. Does anyone know how to fix this issue or what I could be doing wrong?

    Correct answer Fergus H

    @Gabriel36933880ws14 when you say Auto Detect is not working, do you mean:

    1. Turning it on results in video that has blown out highlights? or:

    2. It doesn't change the appearance of the footage at all? 

     

    If the answer is that you get blown out highlights, then Neil's advice to turn on Auto Tone Map Media is spot on. 

     

    However, if turning on Auto Detect isn't making any difference at all - that is, your log video still looks flat - then it's a different issue. Is the log video from a Canon camera? I ask because our Auto Detect function curently only works on Canon video in the MXF container. Video in the MP4 container does not work with Auto Detect. Here's a post with more information:

    https://community.adobe.com/t5/premiere-pro-discussions/does-my-camera-work-with-auto-detect-log-video-color-space/td-p/14149657

     

    @R Neil Haugen "Auto detect simply tells it to note that it is log, not to do anything with it. "

     

    That's not accurate. Auto detect tells Premiere Pro to interpret the clip into its native color space and gamma. While the most common workflow would be to also enable Auto Tone Map Media, not turning it on is a workflow a customer using an HDR working color space might choose. 

     

    Regards,

    Fergus

     

    8 replies

    P
    PoloGibson
    Participant
    April 26, 2025

    i understand what yo are saying. when you dra filed into your timeline premiere doest not atuo detect the log version and you have to maually override the rec 709 in the settings tabe under lumerti color... i also am having this came problem. but the maual override is perfect.

      R Neil Haugen
      R Neil Haugen
      Legend
      April 30, 2024

      @Fergus H 

       

      Fascinating ... I would really appreciate a full delineation on here, from you, about what specifically auto detect does under specific circumstances, and how it interrelates to auto tonemapping in all circumstances.

       

      As when, for example, I've had log media before ...it wasn't 'normalized' to Rec.709 by simply having auto detect log "on". Not without adding either a normalization process (manual or LUT based) or the auto tonemapping.

       

      Details matter, of course ... and I do love specific details.

      Everyone's mileage always varies ...
      Fergus H
      Community Manager
      Fergus HCommunity Manager
      Community Manager
      April 30, 2024

      @Gabriel36933880ws14 if the appearance of the log footage isn't changing at all when you turn on "Auto Detect Log Video Color Space" and you're using a Canon camera, check the format of the file you're working with. Auto Detect currently only works with Canon files in the .MXF container. If the file you're working with ends in anything other than .MXF, Auto Detect does not work. In this case, you'd apply a Canon LUT to the footage to change its appearance. 

       

      @R Neil Haugen "With respects to Fergus, my understanding of auto detect log is that it notes the media 'space', but it is still up to the user to do something about that."

       

      That is incorrect. Simply enabling "Auto Detect Log Video Color Space" should significantly affect the appearance of the file. This is very easy to demonstrate with any log footage that's supported by "Auto Detect Log Video Color Space".

        A3user
        A3user
        Inspiring
        August 26, 2025

        Hi! any plans on Premiere Pro supporting auto detect log for Clog3 files in mp4?

        Fergus H
        Community Manager
        Fergus HCommunity Manager
        Community Manager
        August 26, 2025

        @A3user

        The short answer is: it depends.

         

        Right now, Premiere Pro does not automatically detect the color space for MP4 files from Canon cameras. We’re planning to improve that, but there’s a catch: some Canon models don’t include color space information in their MP4 metadata at all—so there’s nothing for us to detect.

         

        Newer models, like the EOS C80 and EOS C400, do embed this information, and those are the kinds of cases we’re aiming to support.

        Which camera(s) are your MP4 files coming from? That will help us give you a clearer answer.

         

        Thanks,

        Fergus

          R Neil Haugen
          R Neil Haugen
          Legend
          April 29, 2024

          What's the camera and the specific log form?

           

          With respects to Fergus, my understanding of auto detect log is that it notes the media 'space', but it is still up to the user to do something about that. It would not automagically normalize it in a say Rec.709 workflow unless tonemapping is also turned on.

           

          So I'm still wondering what you expect, and what you want? Do you want it normalized, or do you wish to manually normalize that media to linear?

          Everyone's mileage always varies ...
          G
          Gabriel36933880ws14Author
          Participant
          April 29, 2024

          #2 it is not changing the appearance at all.

          R Neil Haugen
          R Neil Haugen
          Legend
          April 23, 2024

          Technically true ... and I should have been more specific. As you're right, if working in HDR/HLG, you can leave off tonemapping at times.

          Everyone's mileage always varies ...
            Fergus H
            Community Manager
            Fergus HCommunity ManagerCorrect answer
            Community Manager
            April 23, 2024

            @Gabriel36933880ws14 when you say Auto Detect is not working, do you mean:

            1. Turning it on results in video that has blown out highlights? or:

            2. It doesn't change the appearance of the footage at all? 

             

            If the answer is that you get blown out highlights, then Neil's advice to turn on Auto Tone Map Media is spot on. 

             

            However, if turning on Auto Detect isn't making any difference at all - that is, your log video still looks flat - then it's a different issue. Is the log video from a Canon camera? I ask because our Auto Detect function curently only works on Canon video in the MXF container. Video in the MP4 container does not work with Auto Detect. Here's a post with more information:

            https://community.adobe.com/t5/premiere-pro-discussions/does-my-camera-work-with-auto-detect-log-video-color-space/td-p/14149657

             

            @R Neil Haugen "Auto detect simply tells it to note that it is log, not to do anything with it. "

             

            That's not accurate. Auto detect tells Premiere Pro to interpret the clip into its native color space and gamma. While the most common workflow would be to also enable Auto Tone Map Media, not turning it on is a workflow a customer using an HDR working color space might choose. 

             

            Regards,

            Fergus

             

              R Neil Haugen
              R Neil Haugen
              Legend
              April 23, 2024

              Are you also setting auto tonemapping in the Sequence section?

               

              They are interactive. Auto detect simply tells it to note that it is log, not to do anything with it. Tonemapping then maps the clip to the sequence CM.

              Everyone's mileage always varies ...
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