With this settings the uploader will generate a thumbnail image on server without touching the original image . On server side it will generate a copy image.
<!DOCTYPE html>
<html>
<head>
<title>Generate thumb on server side</title>
<link rel="stylesheet" type="text/css" href="css/minimal.css" />
<script src="js/RealUploader.js"></script>
</head>
<body><div id="targetElement"></div>
<script type="text/javascript">
var uploader = new RealUploader("#targetElement", {
accept: "image/*",
thumbHeight: 500,
thumbWidth: 0,
thumbPostfix: '_thumb',
thumbFormat: 'jpg'
});
</script>
</body>
</html>