http://www.tineye.com/
and others http://www.makeuseof.com/dir/whostolemypictures-find-duplicate-pictures-online/

On Tue, Sep 4, 2012 at 6:40 AM, Racso <racso@colombia.com> wrote:
Hello.

I have detected that a participant just uploaded photographs he found on internet, so I must proceed to mark them for deletion. Sigh.

My question is, Does someone know about any [semi-]automated tool to verify if uploaded images already existed? I use Google image search, but that tool requires checking single images at a time.

Thanks,
Racso

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James Michael DuPont
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