// Set a maximum height and width							
		$width = 200;
		$height = 200;

		//$timestamp_pic.jpg als Quelle
		$src_file = imagecreatefromjpeg("/images/$timestamp_pic.jpg");

		// Content type
		header('Content-type: image/jpeg');

		// Neue Masse ermitteln
		list($width_orig, $height_orig) = getimagesize($src_file);

		$ratio_orig = $width_orig/$height_orig;

		if ($width/$height > $ratio_orig) {
			    $width = $height*$ratio_orig;
		} else {
			    $height = $width/$ratio_orig;
		}

		// Neues Bild erstellen
		$dest_file = imagecreatetruecolor($width, $height);
		
		// Neues Bild füllen
		imagecopyresampled($dest_file, $src_file, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
		imageinterlace($dest_file);
		
		// Output
		imagejpeg($dest_file, "test.jpg", 80);