Xsane needs a little bit of preference configuration to get it working as a photocopier.
Here is my set-up:
First, you need to know the name of your printer on your system. Run this command in a terminal to get it:
which, on my set up, gives me:
HP-LaserJet-1200-2 acceptant des requêtes depuis ven 25 jun 2010 13:32:29 CEST
Then, in the menu Xsane > Preferences > Configuration (shortcut: [alt]-s ), under the “Copy” tab, give a name to your printer (any name is fine) and as a command, write this:
lpr -P the_name_of_your_printer_on_your_system
As an example, on my system, I had to write this:
lpr -P HP-LaserJet-1200-2
This should be sufficient to get it working.
Although, I also needed to deactivate the “create zlib compressed postscript image for printing” to get it working. But maybe you don't
To write this tutorial, I found some useful info on these pages: