Am Freitag, 6. Juli 2007 19:54:35 schrieb dwelch91:
> Could you try using hp-scan? I tested 600 dpi scanning with it extensively,
> and it seemed to work fine. The command would be:
>
> hp-scan -n -r600 -mlineart -xraw -otest.png
hp-scan wants to scan everything with 100 dpi, regardless which resolution I
give it:
$ hp-scan -n -r600 -mlineart -xraw -otest.png
warning: Output file '/tmp/test.png' exists. File will be overwritten.
HP Linux Imaging and Printing System (ver. 2.7.6)
Scan Utility ver. 0.2
Copyright (c) 2001-7 Hewlett-Packard Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.
Using device hpaio:/net/HP_LaserJet_3055?ip=192.168.22.100
Opening connection to device...
warning: Invalid value for resolution (resolution > max value of 100mm). Using
100mm.
Resolution: 100dpi
Mode: lineart
Compression: None
Scan area (mm):
Top left (x,y): (0.000000mm, 0.000000mm)
Bottom right (x,y): (228.599991mm, 381.000000mm)
Width: 228.599991mm
Height: 381.000000mm
Destination(s): file
Output file: /tmp/test.png
Warming up...
Scanning...
Read 147.2 KB from scanner.
Closing device.
Outputting to destination 'file':
Saving to file /tmp/test.png
=====================================
I looked into the source of sane.py and found out:
in class Option
"
constraint -- constraint on values. Possible values:
None : No constraint
(min,max,step) Integer values, from min to max, stepping by
list of integers or strings: only the listed values are allowed
"
but instead of a tuple constrained is a list of possible resolutions given as
[75, 100, 150, 200, 300, 600, 1200]
so this is misinterpretet as min=75, max=100, step=150 ?
I commented out two lines, and got :
$ hp-scan -n -r600 -mlineart -xraw -otest.png
warning: Output file '/tmp/test.png' exists. File will be overwritten.
HP Linux Imaging and Printing System (ver. 2.7.6)
Scan Utility ver. 0.2
Copyright (c) 2001-7 Hewlett-Packard Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.
HP Linux Imaging and Printing System (ver. 2.7.6)
Services and Status Daemon ver. 9.2
Copyright (c) 2001-7 Hewlett-Packard Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.
Using device hpaio:/net/HP_LaserJet_3055?ip=192.168.22.100
Opening connection to device...
warning: Invalid value for resolution (resolution > max value of 600mm). Using
600mm.
Resolution: 600dpi
Mode: lineart
Compression: None
Scan area (mm):
Top left (x,y): (0.000000mm, 0.000000mm)
Bottom right (x,y): (228.599991mm, 381.000000mm)
Width: 228.599991mm
Height: 381.000000mm
Destination(s): file
Output file: /tmp/test.png
Warming up...
Scanning...
Read 2.8 MB from scanner.
Closing device.
Traceback (most recent call last):
File "/usr/bin/hp-scan", line 1000, in ?
im = Image.frombuffer('RGBA', (pixels_per_line, lines),
buffer.read(), 'raw', 'RGBA', 0, 1).convert('L')
File "/usr/lib/python2.4/site-packages/PIL/Image.py", line 1799, in
frombuffer
im = im._new(
ValueError: buffer is not large enough
===========================================
It seems to me that hp-scan is rather experimental at the moment, but that
wouldn't matter for me, I wouldn't need it anyway if the sane lib scanned
with real 600 dpi...
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