title: PPT to PNG with transparent background
body: <p>I have a PowerPoint .ppt file and I have to create an image for every slide.</p>
  
  <p>I'm trying to use the integrated PowerPoint "export as .png".
  It works but the images have all a opaque background, I need a transparent one.</p>
  
  <p>Anyone knows if is it possible and how to do it? (If not via standard export, also with a macro is fine)</p>