Daniele Can you please clarify, those that remain - are those exact duplicates (listed as duplicates in File Info panel), or those are just similar images, but not exact duplicates?
The thing is, Tonfotos only work with exact duplicates. If you want to look for similar files that are not exact copies, you will need to use separate software for that, that is dedicated spicifically to this function. There you can set the threshold of how similar images should be and so on. This is not an easy task at all, but still manageable. We have a list of applications like that in our blog, some of them are completely free: https://tonfotos.com/articles/best-apps-to-find-and-remove-duplicate-photos/
