title: imagescreatetruecolor with a white background
body: <p>I'm pretty sure I need to use imagefilledrectangle in order to get a white background instead of black on this... just not sure how. I've tried a few ways.</p>
  
  <pre><code>$targetImage = imagecreatetruecolor($thumbw,$thumbh);
  imagecopyresized($targetImage,$sourceImage,0,0,0,0,$thumbWidth,$thumbHeight,imagesx($sourceImage),imagesy($sourceImage));
  </code></pre>