The software is shipped from the factory with a default set of filters. As you add, change, or delete filters, you may overwrite or remove some of these original filters.
To restore some or all of the default set of filters to their original form
after having changed them, enter this command:
/usr/sbin/lpfilter -f filter-name -i
Replace filter-name with the name of the filter to restore or the word all to restore all the default filters.