public function resize($file)
    {
        $new_width = 100;
        $new_height = 100;
        list($width, $height) = getimagesize($file);
        $canvas = imagecreatetruecolor($new_width, $new_height);
        switch($this->getExtension()) {
          case 'jpg':
            $org = imagecreatefromjpeg($file);
            break;
          case 'gif':
            $org = imagecreatefromgif($file);
            break;
          case 'png':
            $org = imagecreatefrompng($file);
            break;
        }
        imagecopyresampled($canvas, $org, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
        print_r($file);
        switch($this->getExtension()) {
          case 'jpg':
            imagejpeg($canvas, $file, 100);
            break;
          case 'gif':
            imagegif($canvas, $file);
            break;
          case 'png':
            imagepng($canvas, $file);
            break;
        }
    }