Colour calibration for PPA printers
-----------------------------------

If you have an HP DeskJet PPA printer (very cheap models: 710C, 712C,
720C, 722C, 820C, 1000C, or a newer printer which works with one of
these model entries) you can optionally do a colour correction. Do the
following:

Some of the printing modes offer optional colour correction. See the
option "Printing Mode" which is offered to you in the option window of
"printerdrake" and if you use CUPS also in "qtcups" or "kprinter"
("Properties" button, "Advanced" tab), "xpp" ("Options" button,
"Extra" tab), "kups" (right click on printer, "Configure printer" in
menu), or the WWW interface ("Configure printer" button) and if you
use PDQ in "xpdq" ("Driver options"). Choose a setting with "optional
colour correction" and save your settings. Read the file

   /usr/share/doc/printer-filters-1.0/HPDeskJetPPA/pnm2ppa/COLOR.txt

and follow the instructions there, but use the name

   /etc/pnm2ppa.gamma_normal

for the colour correction file for the "normal quality" modes and

   /etc/pnm2ppa.gamma_best

for the colour correction file for the "best quality" modes. So you
can do the colour correction independently in both normal and best
quality modes. The files are automatically taken into account by the
appropriate modes as soon as they are created.