protected function _save($filename, $quality)
{
$quality = $quality ?: $this->_quality;
$quality = Helper::quality($quality);
$format = strtolower(FS::ext($filename));
if (!Helper::isSupportedFormat($format)) {
$format = $this->_mime;
}
$filename = FS::clean($filename);
// Create the image
$result = $this->_renderImageByFormat($format, $filename, $quality);
$this->loadFile($filename);
$this->_quality = $quality;
return $result;
}