With the current release of this guide, my own HP DeskJet 970 is a better-supported printer! Using the –s DEVICE=cdj970, I have support for the following new parameters in GhostScript:
These are known to work with other HP printer drivers as well. You can find out if your own HP printer works with these parameters at the very helpful http://www.openprinting.org/driver_list.cgi website.