title: Error saving an image using PIL
body: <p>I am trying to use the <code>getbbox</code> to crop a picture and then save it. However I keep on getting a certain error that I don't know how to fix. </p>
  
  <p>The code: </p>
  
  <pre><code> import ImageOps
   import Image
  
   im=Image.open("b1.jpg")
   invert_im = ImageOps.invert(im) # because the boundary is white so I convert it to black so I can crop the photo
   im2 =invert_im.getbbox() 
   invert_im = ImageOps.invert(im2) # invert back
   invert_im.save("b1_cropped.jpg") 
  </code></pre>
  
  <p>The error I am receiving:</p>
  
  <pre><code>AttributeError: 'tuple' object has no attribute 'save'
  </code></pre>
  
  <p>Any ideas?</p>