title: Rotate photo via python
body: <p>I have a photo on my disk and I want to rotate it clockwise in 90 degrees. I'm trying to use PIllow as described here:
  <a href="http://pillow.readthedocs.org/en/3.0.x/handbook/tutorial.html#geometrical-transforms" rel="nofollow">http://pillow.readthedocs.org/en/3.0.x/handbook/tutorial.html#geometrical-transforms</a></p>
  
  <pre><code>pill_img = Image.open(abs_img_src)
  pill_img.rotate(90)
  </code></pre>
  
  <p>But nothing changes. Did I miss something?</p>