[sane-devel] Color components not overlapped

[Marco]

I'm scanning with
>>> scanimage (sane-backends) 1.0.18-cvs; backend version 1.0.18
>>> sane-avision backend
>>> HP ScanJet 5300C usb scanner

At every resolution I tried (150, 300, 400, 600 dpi), the three color
components have a vertical shift from each other.

http://img125.imageshack.us/my.php?image=shiftsv0.png

In windows the scanner works fine. What could I try?

Thanks,
marco