if ( ! empty($ext) && $ext == 'gif') {
                $netpbm_cmd = $PATH_TO_NETPBM . 'giftopnm "' . $source_file_path . '" | ' . $PATH_TO_NETPBM . 'pnmcut ' . $pos_left . ' ' . $pos_top . ' ' . $LIMIT_Width . ' ' . $LIMIT_Height . ' | ' . $PATH_TO_NETPBM . 'ppmtojpeg -quality=75 > "' . $dest_file_path . '"';
            }