title: create image on nodejs with graphicsmagick
body: <p>I need a way to create an image on graphicsMagick via node.js </p>
  
  <p>Normally I can manage this with;</p>
  
  <pre><code>gm convert -background transparent -pointsize 30 -gravity Center label:türkçee HEEEEEY.png
  </code></pre>
  
  <p>I need the equivalent of this input in node.js like;</p>
  
  <pre><code>var gm = require('gm');
  gm.background('transparent')
    .gravity('Center')
    .fontSize(30)
    .drawText('Test')
    .write('HEEEY.png')
  </code></pre>
  
  <p>PS: I don't want to give image size as parameter. (sorry for my english)</p>