title: php imagick, how to make an area transparent
body: <p>I want to make an area transparent within an Imagick object with a specific width, height  and a top position.</p>
  
  <p>For example I need a transparent area with 30px x 30px from the 15th px to the top but I can't find a way to do it. </p>
  
  <pre><code>$canvas1 = new Imagick();
  
  $canvas1-&gt;newImage(30,60,'black','png');
  </code></pre>
  
  <p>Please help.</p>