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berliner_ffm
berliner_ffm
Inspiring
October 22, 2023
Question

Refresh DNG-Preview not working

  • October 22, 2023
  • 6 replies
  • 1446 views

Since the latest release of Lightroom (ACR as well) the Refresh DNG Preview function is not working anymore. It will only embed a very small preview in the "PreviewImage" tag, but no fullsize preview as requested. 

Example DNG can be found here: https://u.pcloud.link/publink/show?code=XZPVYrVZJggbvp2qJhFu4qphbiYJnYuJMrfX 

 

 

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    6 replies

    Rikk Flohr_Photography
    Community Manager
    Rikk Flohr_PhotographyCommunity Manager
    Community Manager
    November 13, 2023

    Please note the compression format used in DNGs (Panos and HDRs) was updated recently. I wonder if the issue is that the non-Adobe apps you are using to inspect previews are not yet supporting the DNG 1.7 spec. This is the case for Mac Finder and Windows Explorer as well. 

    Rikk Flohr: Adobe Photography Org
      berliner_ffm
      berliner_ffmAuthor
      Inspiring
      November 13, 2023

      Hallo @Rikk Flohr: Photography ,

      thanks for the hint. My understanding was, that the DNG itself uses some different kind of compressing since version 1.7 

      But I am talking about the JPG preview embedded into the DNG. I opted to create a full size embedded preview, but all I got was a file which is noch much larger than an icon. See the linked image in my original post. Also when using ExifTool, it shows, that only the PreviewImage-tag exists, which contains about 12kb of data for a 20MP file.

      No other previewtags like "JpgFromRaw" exist in metadata.

      So while I understand, that the raw viewing might be limited in some applications, it seems, that this is not related to my problem. I need the fullsize jpg embedded in the DNG like the function in Camera Raw suggests.

      If I am wrong, please tell me in which exif-tag the new preview is stored, so that I can have a deeper look at it, but so far I could not find any other binary data in the image that could be a match.

      Again I am not talking about decoding the DNG to create a preview. I am talking about the embedded preview generated in Lightroom via the option shown above or the equivalent in camera raw.

      Thanks!

        Rikk Flohr_Photography
        Community Manager
        Rikk Flohr_PhotographyCommunity Manager
        Community Manager
        November 13, 2023

        One of our engineers suggests using Bridge to interrogate the post-update thumbnail to see if it truly updates. Have you done this? 

        Rikk Flohr: Adobe Photography Org
        berliner_ffm
        berliner_ffmAuthor
        Inspiring
        November 10, 2023

        @Rikk Flohr: Photography : could you please move this to the problems subforum and have a look at it. It is really a problem for any program relying on embedded previews. Thank you!!

        felipeboca
        felipeboca
        Participating Frequently
        October 24, 2023

        Same problem here, the DNG file previews are terrible. I usually view files in the Mac finder or in apps like Photo Mechanic, but it's really bad. As said above, updating the file view through LR is not working.

        GoldingD
        GoldingD
        Legend
        October 22, 2023

        This might be completely wrong, but???

         

        In preferences, what do you have in this area:

         

         

        berliner_ffm
        berliner_ffmAuthor
        Inspiring
        October 22, 2023

        This setting is set to "Full size".  All other Exif data is still present so I assume the problem is different from the one mentioned above. It affects basically all HDR-/Panorama-DNGs stitched in Lightroom. The don't include a full size preview by default no matter what setting is used, so the advice I got here in from the LR officials was to use the functionality to update the preview in Lightroom or ACR, which worked fine until LR 13 came out.

        felipeboca
        felipeboca
        Participating Frequently
        October 24, 2023

        Same problem here....

        GoldingD
        GoldingD
        Legend
        October 22, 2023

        Is your problem anything like the one in this posting?:

         

        https://community.adobe.com/t5/lightroom-classic-discussions/exif-lost-when-copying-dng-to-remote-folder/m-p/14178008

         

         

        GoldingD
        GoldingD
        Legend
        October 22, 2023
         the Refresh DNG Preview function

        The What?

        Please pots a screenshot

         

        berliner_ffm
        berliner_ffmAuthor
        Inspiring
        October 22, 2023

         

         

        Here is the menu item. This should refresh the DNG preview. The size setting for the preview can be set to "Full Size" in the application settings. However since LR 13 this is not working anymore. It pretends to create a new preview, but none is written to the dng file.

        GoldingD
        GoldingD
        Legend
        October 22, 2023

        Ok, I looked right past it. I have no clue.

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