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Images being changed to .dng JPEG

Engaged ,
Mar 31, 2022 Mar 31, 2022

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I don't know if this is a bug, but it's strange.

Windows PC, Windows 11 Pro, Lightroom Classic 11.2


Yesterday I consolidated an older pair of folders.  I selected all the images in folder B and moved them to folder A.  In Lightroom.  Nothing else.  Just a move about 1000 images from one folder to another.


Later, I did a synchronize on folder A and found that I had 44 files missing.  Except they AREN'T missing.  All of them are jpegs, and they're in physical folder A, having been copied yesterday from folder B.  In in all 44 cases, the jpeg was generated at some point during processing.


Years ago, when it was popular, all the .NEF files were converted to .dng during import, and all the subsequent processing was done on the .dng files.  In all 44 cases, the original image, a .dng file, had the file extension changed from .dng to .dng+JPEG.  I have NEVER imported an image as either RAW or dng +JPEG, and it's ONLY these 44 that now have the altered file extension.


NO, in Prefs I do not, nor have I ever had the "Treat JPEG files next to RAW files as separate photos" turned on.  I don't see any other preferences related to "raw+jpeg" processing.


AND, recently I've been helping another Lightroom user organize her catalog.  As part of that we periodically move images from one folder to another.  So different person, different computer, different location, same version of Lightroom Classic.  I noticed early in the process that SOME of her RAW images were .ARW+JPEG but presumed she HAD been importing that way.  She said she hadn't, and like my system, only a FEW, random images HAD the .ARW+JPEG file extension.

So, DSC1234.ARW through DSC1239.ARW might be fine, then DSC1240.ARW+JPEG, then DSC1241.ARW next to it. 


HOW do I get Lightroom to CHANGE this back to .dng, or in her case .ARW, so the jpgs with the RAW images STOP being seen as missing?  AND, how do I prevent this from happening in the future when doing a simple move from folder to folder?








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