[sane-devel] HP3670c calibration problem?
carlos.maziero at gmail.com
Tue Nov 18 22:38:51 UTC 2014
I have a problem with my HP3670c scanner: when I scan some documents in
sequence, the first page is good (clear and bright), but the following
are much darker. If I leave the scanner idle for some time (20 min or
more), the pattern repeats.
I've packed three consecutive scans of the same document (white paper,
black printing) as an example:
scan 01: http://filebin.ca/1hi6F5IRZ0nq/scan01.tgz
scan 02: http://filebin.ca/1hi6c0tiBGDJ/scan02.tgz
scan 03: http://filebin.ca/1hi6tBYqo94r/scan03.tgz
Each .tgz file has scanned image (jpg file), a lot of debugging .pnm
files, and the debugging output of the Genesys backend.
The scans were performed using scanimage:
/usr/bin/scanimage --device genesys:libusb:001:004 \
--resolution 300dpi --mode Color \
--brightness 25 --contrast 0
I also tried including the option "--clear-calibration", but apparently
I'm using the last SANE backends (1.0.25 stable, built today from Git)
# scanimage -V
scanimage (sane-backends) 1.0.25git; backend version 1.0.25
# scanimage -L
device `genesys:libusb:001:004' is a Hewlett Packard ScanJet 3670c
Do you have any suggestions on how to solve this issue?
Prof. Carlos Maziero, PhD <http://dainf.ct.utfpr.edu.br/%7Emaziero>
/DAInf/UTFPR - Curitiba PR, Brazil/
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