Finding duplicated photo

[TheSaint]

Hello,

I came across the problem that Gwenview moves the photo from the camera 
memory by renaming them, but later I forgot which where moved.
Then I tought about a small script in python, but I stumbled upon my 
ignorance on the way to do that.

PIL can find similar pictures. I was thinking to reduce the foto into gray 
scale and resize them to same size, what algorithm should take place?
Is PIL able to compare 2 images?
 
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