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Is there a reliable way to determine if two or more photos are the same, regardless of relative image size differences?

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    what do you mean? – osullic Dec 17 '18 at 15:26
  • I have a collection of photos and some of them are simply downsizings of an original one. I would like to be able to automatically remove the downsized pictures and keep the original only. This happened because through the years I automatically backed up pictures shared in social media which resized the original - so I ended up with lots of resizes of the original photos. – Paulo Matos Dec 17 '18 at 16:10
  • Could you please use an English word or phrase that communicates what 'modulo' means in another language? – Michael C Dec 17 '18 at 16:45
  • In your question, are you using this word "modulo" to mean "ignoring" or "apart from"? I have only ever encountered "modulo" in the context of dividing numbers and getting the remainder. – osullic Dec 17 '18 at 16:54
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    If so, I have used VisiPics (on Windows) to do what you want. – osullic Dec 17 '18 at 16:57
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I am going to steal @osullic comment.

If so, I have used VisiPics (on Windows) to do what you want.

I have tested it a bit and it is doing a decent job. It is a really small application for windows. It can be improved a lot, but it works.

It marks as green if it feels it is an exact duplicate, and some other colors like orange if it is just similar.

Another option: duplicate-finder.com It assumes the bigger file is the original, but it makes a good job.

This two, unfortunately, seems to be discontinued.

Another that does the job is pixiple.

There are some other alternatives, which I still need to test. https://alternativeto.net/software/duplicate-photo-finder/

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