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It appears I am allowed to upload duplicate photos. I was hoping Piwigo would check for duplicates, but it seems it does not. I think one way to do this, as Mediawiki does, is to create a hash for the original image. Then for every image put into the upload queue, create a hash and check if that hash exists in the array of existing hashes.
I believe I'm using Piwigo version 2.7.4. Note this is a "one-click install" on a shared Dreamhost server.