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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