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What tools might be available in Ubuntu to scan many image files and detect similar ones despite different sizes, formats, etc?

Support for batch mode/cli would be especially good. For example, so I could write a script to favor the higher resolution/color depth versions and delete others.

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Graphically Digikam can do that.

Digikam screenshot


For the command line you can use findimagedupes.

The simple command to find recursively and report similar images is findimagedupes -R ~/Pictures.

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    Thanks. My search in the repos also found me findimagedupes and puzzle-diff. Like Digikam, Google's Picasa also has a gui tool for spotting repeated images, and it can be persuaded to run under Linux (via wine or natively maybe?)
    – Marcos
    Apr 17, 2012 at 22:48
  • Picasa runs (barely) under wine.
    – desgua
    Apr 18, 2012 at 22:53
  • Exactly the same algorithm as findimagedupes implemented in Python (with GraphicsMagick doing the heavy lifting) here: github.com/pts/pyfindimagedupes
    – pts
    Dec 1, 2016 at 16:53

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