title: Is it possible to detect duplicate image files?
body: <p>I have over 10K files for products, the problem is is that many of the images are duplicates.</p>
  
  <p>If there is no image, there is a standard image that says 'no image'.</p>
  
  <p>How can I detect if the image is this standard 'no image' image file?</p>
  
  <p><b>Update</b>
  The image is a different name, but it is exactly the same image otherwise.</p>
  
  <p>People are saying Hash, so would I do this?</p>
  
  <pre><code>im = cStringIO.StringIO(file.read())
  img = im.open(im)
  md5.md5(img)
  </code></pre>