title: im4java Convert svg to png, keep transparent background
body: <p>I'm using the im4java library to convert svg files to png files. I want the transparent backgrounds to remain transparent but they always become white. This is the operation I'm using:</p>
  
  <pre><code>IMOperation hdpiOperation = new IMOperation();
  hdpiOperation.addImage();
  hdpiOperation.background("none");
  hdpiOperation.addImage();
  </code></pre>
  
  <p>If I manually try with ImageMagick from the commandline using this command it does work:</p>
  
  <pre><code>convert -background none a.svg b.png
  </code></pre>
  
  <p>Any ideas?</p>