title: Canvas to high resolution image
body: <p>I am working on web app which has to export a high definition image from canvas (which is kind of screen shot of the web page). So the exported image has to have up <strong>300dpi</strong> so it would be printable. 
  Any known way of doing this ? 
  What I have done some far is exporting the image with 96dpi which isnt quite what I was looking for ...</p>
  
  <p>Thanks!</p>