To find duplicates photos isn't easy, especially when you have them a lot. I've found two methods: imgdupes (a Python script) and DupDetector (quite old - 2002, MS Windows application).

To manage my photos I've used F-spot, but it's quite old (2010) and when number of files coming to 30000 importing new files was painful.

I ponder two applications: Shotwell and piwigo.org. There third option is to use both of them with piwigoshotwell as connector.
While Shotwell is desktop application (can import F-spot database), the Piwigo (formerly PhpWebGallery) is web based software.

Darktable could also be good, but CentOS isn't supported...

Just my blog...

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