title: Why is my _getexif() returning None?
body: <p>I have the following <code>Python</code> script:</p>
  
  <pre><code>from PIL import Image
  from PIL.ExifTags import TAGS
  
  img = Image.open('/path/1.jpg')
  info = img._getexif()
  print info
  </code></pre>
  
  <p>Why is <code>info</code> returned as <code>None</code>, although that I made sure that <code>img</code> has been read?</p>
  
  <p>Thanks.</p>