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Do a md5 hash of all the pictures.. print the file names where duplicates exist, move duplicates to a new folder and delete folder..

It will still eliminate a schiteload of images which is a good start.Not so trivial if you have resized/edited images for web/whatsapp,etc, the hash will be diff.
You'll need more intelligent s/w
CCleaner is free and has a Duplicate File checker that I use.Several folders on my hard drive contain duplicate pictures.
Pse recommend a free programme to search for duplicates. I'll delete them manually.
TIA
Use this,
https://dupeguru.voltaicideas.net
http://www.pixelbeat.org/fslint/
dupeGuru will run on any os.
Fslint is a linux app but it will run from a liveusb on just about any system. It's a cli app with a gui front end so the cli component might even run on Win10 using bash and osx using macports/xdarwin etc.
Both can analise the file contents via hashing which is what you want.
Do they have the same file name, or different names?
are they named the same or at least very similar?
a simple c# console app will do this
Do a md5 hash of all the pictures.. print the file names where duplicates exist, move duplicates to a new folder and delete folder..