static function item_created($item)
 {
     if ($item->is_photo()) {
         $input_file = $item->file_path();
         $output_file = system::temp_filename("rawphoto-", "jpg");
         $success = rawphoto_graphics::convert($input_file, $output_file);
         if ($success) {
             $item->set_data_file($output_file);
             $item->save();
             unlink($output_file);
         }
     }
 }