title: How to convert filetype using GraphicsMagick for node.js
body: <p>How do you "Convert" a file from one type to another using gm? (e.g .png > .jpg)</p>
  
  <p>I found <a href="http://www.graphicsmagick.org/convert.html" rel="nofollow">this</a> but it doesn't seem that <a href="http://aheckmann.github.io/gm/docs.html#manipulation" rel="nofollow">the node.js version</a> has the same method:</p>