[sane-devel] Color balancing with a HP ScanJet 3200C

[stef]

Le Saturday 30 August 2008 18:05:38 Francesco Poli, vous avez écrit :
> Hi everybody (again)!
>
> Thanks to Stef's suggestion I managed to get my HP ScanJet 3200C to
> work again.  As previously said, it's a parallel port scanner, which
> seems to work with the umax_pp backend.
> I am using Debian GNU/Linux (testing branch), which includes
> SANE version 1.0.19.
>
> I am now trying to get a decent scan quality.
>
> If I scan something with:
>
>   $ scanimage -d umax_pp --format tiff --mode Color --resolution 300 >
> out.tiff
>
> I get an overly red image, which can be enhanced by correcting the color
> balance with Gimp.
> I would prefer obtaining a decent color balance by default, though.
> I performed some tests, by visually comparing the original paper with
> the scanned image (and reading RGB values picked with gcolor2).
>
> I thought that editing {red,green,blue}-{gain,offset} options
> in /etc/sane.d/umax_pp.conf would be able to fix my problem.
> However, changing those values does not seem to have much effect on the
> resulting scan.
>
> Am I failing to understand something?
> Can someone please suggest good {red,green,blue}-{gain,offset} values
> for the HP ScanJet 3200C ?
>
> I searched the web, but failed to find good hints.

	Hello,

	if you enable advanced options in xsane, you will be able to tune gain and 
offset manually to your liking. BTW does the scanner gives good scans under 
windows ?

Regards,
	Stef