This uses 3 digits not just three in the png files. I'm not sure if
I'll get to needing it or not, but I wouldn't be too surprised if not
this project, some project will need it.
This is enough to get me working PDF output. I'm not sure if I can
automate it to put into Laidout to get print output, or if I just run
that from pngs that I'm already creating and manually bring them into
Laidout.
Jigme Datse Yli-Rasku