title: reportlab: add background image by using platypus
body: <p>this is a bit related to this <a href="https://stackoverflow.com/questions/5138301/background-image-using-report-lab">post</a></p>
  
  <p>I am trying to place an image on the background, and I want to be able to write text over it.
  using <code>canvas.drawImage</code> helps, but that's too low level approach for me. <br/>
  My program uses platypus, but <code>canvas.drawImage</code> is part of different library.
  I've been able to insert images with <code>platypus.Image</code>, but couldn't figure out how to make it as background.<br/>
  Any advice would be great,</p>
  
  <p>Thanks
  D</p>