Hi there, thanks to Monty, it is now possible to obtain rather good pictures from the CanoScan devices that were supported by the Plustek backend. If you are interested, please download the sources plustek-0.46-TEST1.tar.gz from gjaeger.de/scanner =20 Thanks again to Monty! I've moved your code to the file plustek-usbcal.c.= =2E. Gerhard