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I've been using XnView for this on Windows, it has a side-by-side comparison mode where zooming into one image zooms into the other at the same time, so you can take several pictures of the same scene, then compare details side-by-side and delete the inferior ones until only the best is left.

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I sync all my phone's photos with my computer, compare them on the computer, and the deletions sync back to the phone. It would be nice if there were an Android app that does this directly on the phone, though. Know of any?

(Similar to Side-by-side image viewer for Android with RAW (DNG) file support except that one didn't get answered, because it was based on a misunderstanding of raw images.)

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I can recommend Photo Compare. It's an app I wrote and have been maintaining exactly because I couldn't find any good image compare app for Android.

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  • It's not immediately obvious how to use it. I open it, it shows me folders, then I go in one and select a photo, and then it shows me that photo and the next one in the folder, then I can zoom and pan, which is good, and there's a box which is clickable as a checkmark, "Image was added to selection". I can barely see the checked box on top of my image. I'm not sure what to do after checking a box. Is that box for the images I want to delete or the ones I want to keep? – endolith Oct 17 at 23:41
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    Thank you for the feedback, @endolith. When comparing images, there's an action menu (top right) which should help you along. Maybe also check out this blog nerdschalk.com/how-to-compare-two-photos reviewing the app. – Simon Oct 18 at 4:16
  • Ok, I still don't understand how to use it. You can compare two images at a time, and select one of them, but you can't do a "round-robin tournament" of a group of images? And then you can either delete the selected images or "Delete all others". But what is "all others"? There was never any initial selection of a group of images. Does it delete all others in the folder, for instance? That would be disastrous in a Camera folder. – endolith Oct 19 at 14:23
  • In other words, if I take 7 images of the same flower, and 5 images of the same mushroom, all stored in the same folder, and I want to keep only 1 best flower and 1 best mushroom, and delete the others, how do I do that with your app? The Pic Perfect app does the elimination process well, for example, but it could use some improvement in the interface – endolith Oct 19 at 14:23
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    Thanks for the example use case; this is one where PhotoCompare can definitely be improved. With the current version, you'd actually have to select the unwanted ones and then delete those. – Simon Oct 19 at 15:03
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Found an app that does this:

Pic Perfect (Image Compare)

Pros:

  • Shows two pictures at a time, cycling through all pairs to find the best
  • Zooms both simultaneously
  • Can delete or move the pictures

Cons:

  • Interface is not clear
    • Has Quick vs Complete mode, or Sequence vs Multiple mode, which seem to be the same thing??
    • Gives you the option to delete the perfect pic, which I thought was to delete the non-perfect pics, because why would you want to delete the perfect one??
  • Would be nice if I didn't have to navigate to the Camera folder every time.
  • Would be nice if it remembered that I want to do nothing to the perfect picture and delete the others.
  • Slow to open the folder navigation
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