Can you also try to use your printer with the SpliX driver? Perhaps this driver gives better quality.
If you use the printer with drivers of foo2... series (foo2zjs package) run the command
sudo getweb 6110
in a terminal window to download the printer's color profiles. This often improves the print quality, too.
Can you also try to use your printer with the SpliX driver? Perhaps this driver gives better quality.
If you use the printer with drivers of foo2... series (foo2zjs package) run the command
sudo getweb 6110
in a terminal window to download the printer's color profiles. This often improves the print quality, too.