As the author of the Artec backend awakens from his holiday slumber......
The low-end models of the Artec scanners do not support brightness in
hardware. There is a brightness option, but it is defined as being
INACTIVE (visible by doing a scanimage -h). From looking at other
backends, it looks like when an option is inactive, the backends do the
same thing the Artec backend does if you try to set that option with
sane_control_option(), they return SANE_STATUS_INVAL. I have downloaded
the winsane frontend but don't have Windows installed anywhere here at my
house in order to test it. Guess that old 486 might get used after all. :-)
I don't know if this is why the program was messing up for Andre, but
it may be the frontend does not handle SANE_STATUS_INVAL.
For the low-end Artec scanners (which I happen to have one of) I'm going
to have to do the brightness in software according to the docs. The
high-end Artec models support brightness in hardware, but I have not yet
implemented it (actually I think they support brightness per RGB channel).
Chris
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** Chris Pinkham Linux v2.2.0-pre3, Sane v1.00, GIMP v1.0 **
** cpinkham@sh001.infi.net http://www4.infi.net/~cpinkham/ **
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