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Compare two PIL images in Python

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  1. h1 = Image.open("image1").histogram()
  2. h2 = Image.open("image2").histogram()
  3.  
  4. rms = math.sqrt(reduce(operator.add,
  5. 	map(lambda a,b: (a-b)**2, h1, h2))/len(h1))

URL: http://mail.python.org/pipermail/image-sig/1997-March/000223.html

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