title: dompdf not displaying image generated by PHP file
body: <p>I'm using dompdf to generate a PDF file. In the file I'm including an image that is generated on the fly by PHP by using;</p>
  
  <p><code>&lt;img src="image.php" /&gt;</code></p>
  
  <p>When I view the page I can see an error saying "Image not found" which links to the supposedly not found image which displays fine when you click on it.</p>
  
  <p>I've tried adding a .png extension to the page generating the image but that doesn't make any difference. I've also saved the generated image to the server and linked to that instead and it works fine.</p>
  
  <p>The only method I can think of to solve this is to save the image on the server and then link to that. Ideally, I don't want to do this so I was wondering if anybody had come across this before or if anyone can think of a fix for it.</p>
  
  <p>The version of dompdf I'm using is 0.6.0 beta 3 and I'm using it with CodeIgniter.</p>