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

[Markus Haberkorn]

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?

with kind regards.

Markus Haberkorn

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