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Leithal
Participant
November 28, 2023
해결됨

Lightroom 13.0 merged dng files are suddenly very small

  • November 28, 2023
  • 1 답변
  • 4226 조회

I have updated to LR 13.0 and found that merged dng files (for panoramas) are now very small. For example, I merged three 76MB RAW files and the resulting dng was only 18MB. Normally the merged dng file would be more than 200MB. However I found that when I exported the dng file as a tiff without compression at 300dpi it did exceed 200MB. 
I've gone back and checked previous merged dng panoramas and observed that they were very large but when I merged them again in the 13.0 version of LR they suddenly dropped down to about a tenth of the files merged before updating.

I am using an M1 Mac Mini and running Ventura.

What's going on? Any ideas? 

    최고의 답변: Jao vdL

    Adobe updated the compression algorithm they use in merged panoramas, HDR and enhanced dng images to jpeg XL compression which is far more efficient than the jpeg compression they were using before that. So that's what you're seeing the effect off. There is no loss in quality as a result just much more efficient compression.

    1 답변

    J
    Community Expert
    Jao vdLCommunity Expert답변
    Community Expert
    November 28, 2023

    Adobe updated the compression algorithm they use in merged panoramas, HDR and enhanced dng images to jpeg XL compression which is far more efficient than the jpeg compression they were using before that. So that's what you're seeing the effect off. There is no loss in quality as a result just much more efficient compression.

      G
      giovannil15990362
      Known Participant
      December 26, 2023

      Thank you for the wonderfull answer. I g¡had the same problem.

      Still I can't wrap my mind around it. on how is possible to have a panorama, in my case 3 times shifted 30MB, in a 17MB lossless DNG. And how is it then the correct MB weight is again there in PS when opened as a TIFF. I would really like to read something more specific about it. I found the temathic quite compelling. did Adobe publish something.

      thanks again for the infos

      J
      Community Expert
      Jao vdLCommunity Expert
      Community Expert
      December 26, 2023

      The dng is not losslessly compressed is the trick. It is a lossy but extremely high quality impossible to ditinguish dng. The compression algorithm is jpegXL which is far higher quality than jpeg compression. It's done at the raw demosiaced level so nothing like what people think of as jpeg. Adobe's reasoning is that the demosaic, the panorama stitch, the denoise, the HDR merge is already lossy, so using a lossy compression algorithm will not lead to additional loss and this really appears to be true.  

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