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karlding/camera-raw.md

Created August 16, 2017 03:32
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Deleting the JPG previews while keeping the DNGs
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camera-raw.md

On my Nexus 5, I started shooting in RAW mode with JPG previews. However, when I copy the DNGs over to my laptop for editing/archival, I don't care about the JPG files.

The camera app creates two files:

  1. filename.jpg: the JPG preview
  2. filename.dng: the RAW file

Basically, we want to remove any JPG files for which a RAW file also exists. I just use this bash one-liner (which I run in bash for Windows).

 for img in *.jpg; do [[ ! -f "${img%.jpg}.dng" ]] || rm -- "$img"; done

Basically, for each image that matches the *.jpg globbing pattern, it tests whether a dng file does not exist (by stripping off the .jpg extension and adding .dng. If this test succeeds, then the exit code is 0 and the command doesn't continue. Otherwise, it removes the JPG preview image.

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