title: Graph is too large for cairo-renderer bitmaps
body: <p>Im trying to use pyreverse to generate UML images for a project source code. When I run the pyreverse command and specify to generate png images, it runs and then after a while, it shows:</p>
  
  <pre><code>dot: graph is too large for cairo-renderer bitmaps. Scaling by 0.271394 to fit
  dot: graph is too large for cairo-renderer bitmaps. Scaling by 0.333083 to fit
  </code></pre>
  
  <p>Then if I open either image, the text is unreadable because it got scaled.
  Is there a way to just not scale, and let the image be large size?</p>
  
  <p>Thanks</p>