title: I can't open this PNG file with imagecreatefrompng()
body: <p>Here is a PNG file: <a href="http://imgur.com/NUl4v.png">http://imgur.com/NUl4v.png</a> <em>(Yes, never mind that it's a funny penguin with a sign...)</em></p>
  
  <p>When running the following code:</p>
  
  <pre><code>imagecreatefrompng('http://imgur.com/NUl4v.png');
  </code></pre>
  
  <p>I get an error:</p>
  
  <blockquote>
    <p><b>PHP Warning</b>:  imagecreatefrompng() <em>[function.imagecreatefrompng]</em>: Cannot read image data in /home/test/...</p>
  </blockquote>
  
  <p>The PNG file seems to be fine - I can open it with different editors, and the Unix <code>file</code> command reports that it is:</p>
  
  <blockquote>
    <p><code>PNG image, 640 x 360, 8-bit/color RGB, non-interlaced</code></p>
  </blockquote>
  
  <p><strong>PHP version:</strong> 5.2.13<br>
  <strong>GD version:</strong> bundled (2.0.34 compatible)</p>