[sane-devel] Fujitsu FI-5220C and no Option for threshold possible?

[m. allan noah]

On Tue, Sep 2, 2008 at 7:56 AM, Markus Haberkorn
<Markus_Haberkorn at genua.de> wrote:
> Hello,
>
> I use scanner Fujitsu FI-5220C and it works fine.
>
> /usr/bin/scanadf --mode Gray --resolution 150 --source "Flatbed" -e 1 -s 1 -o foo.pnm -v
> scanadf: scanning image of size 1275x1650 pixels at 8 bits/pixel
> scanadf: acquiring gray frame
> scanadf: min/max graylevel value = 13/255
> Scanned document foo.pnm
> Scanned 1 pages
>
> But I tried to
> modify the white point of scanned pages. But the option "threshold",
> given by the help (scanadf --help -d fujitsu) is not recognized.
>
>  /usr/bin/scanadf --mode Gray --resolution 150 --source "Flatbed" -e 1 -s 1 -o foo.pnm --threshold 100 -v
> /usr/bin/scanadf: unrecognized option `--threshold'
>
>
> So what is the right way to manipulate the brightness of scanned
> pages?

if you are running a recent version of sane, --brightness is what you
want. --threshold is for setting the black/white break point in the
lineart/halftone modes. your problem is that you need to run scanadf
--help with your other parameters in it:

scanadf --mode Gray --help

if that does not show the brightness and contrast options, then a SANE
upgrade might be required.

allan

>
> with kind regards.
>
> Markus Haberkorn
>
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