dependencies: hplip xsane
scan for scanners/printers
hp-probe
make uri from found scanner/printer ip address
hp-makeuri 192.168.0.201
open xsane with connection to printer
xsane "hpaio:/net/Officejet_6600?ip=192.168.0.201"
'optimal' gray config
300 dpi, 0.6 gamma, 0 brightness, 0 contract