as far as I see the problem with the UC840 (and may be with the UC630 too)
is a problem between the umax-driver and the version of the firmware.
I heard of somone with a UC840 V1.6 that the scanner works in rgb-mode.
A UC840 V1.5 does not work in rgb- and greyscale-mode.
May be it helps to update (or may be "downdate") to version 1.6 (or later?)
If someone tries it, please let me know!
Bye
Oliver
-- Source code, list archive, and docs: http://www.azstarnet.com/~axplinux/sane/ To unsubscribe: mail -s unsubscribe sane-devel-request@listserv.azstarnet.com