[sane-devel] Epson Perfection 610 Issue with 150 dpi scan

[Rainer Dorsch]

Allan,

(cc'ed Karl Heinz since he is listed as epson backend author)

I used latest git code now.

rd at dell:~$ scanimage --version
scanimage (sane-backends) 1.0.21cvs; backend version 1.0.21
rd at dell:~$  

The first thing I noticed is that the code has issues with long-format 
options:

rd at dell:~$ scanimage --device-name='epson2:libusb:001:004' --mode='Color' -y 
297 -l 0 --resolution='300' -x 210 -t 0 --verbose > test300.pnm
scanimage: unrecognized option `--device-name=epson2:libusb:001:004'
rd at dell:~$ 

and

rd at dell:~$ scanimage -d 'epson2:libusb:001:004' --mode='Color' -y 297 -l 
0 --resolution='300' -x 210 -t 0 --verbose > test300.pnm
scanimage: unrecognized option `--verbose'
rd at dell:~$

The 300 dpi test (working with the old code as well)

rd at dell:~$ scanimage -d 'epson2:libusb:001:004' --mode='Color' -y 297 -l 
0 --resolution='300' -x 210 -t 0 -v > test300.pnm
scanimage: scanning image of size 2480x3508 pixels at 24 bits/pixel
scanimage: acquiring RGB frame
scanimage: min/max graylevel value = 107/255
scanimage: read 26040000 bytes in total
rd at dell:~$ scanimage --device-name='epson2:libusb:001:004' --mode='Color' -y 
297 -l 0 --resolution='300' -x 210 -t 0 --verbose > test300.pnm
scanimage: unrecognized option `--device-name=epson2:libusb:001:004'
rd at dell:~$

With 150 dpi (broken in 1.0.19)

rd at dell:~$ scanimage -d 'epson2:libusb:001:004' --mode='Color' -y 297 -l 
0 --resolution='150' -x 210 -t 0 -v > test150.pnm
scanimage: scanning image of size 1240x1754 pixels at 24 bits/pixel
scanimage: acquiring RGB frame
scanimage: min/max graylevel value = 140/255
scanimage: read 6510000 bytes in total
rd at dell:~$ 

looks good so far, but 

rd at dell:~$ convert test150.pnm test150.png
convert: unable to read image data `test150.pnm'.
convert: missing an image filename `test150.png'.
rd at dell:~$ pnmtopng test150.pnm > test150.png
pnmtopng: EOF / read error reading a row of pixels
rd at dell:~$ 

demonstrates that the current git code has the same issue as 1.0.19.

For reference I provide test150.pnm at

http://bokomoko.de/~rd/test150.pnm

kuickshow shows that essentially all scan data is in the file, I would hope it 
is only a small issue which needs to be fixed, any ideas where to look at?

Thanks,
Rainer

Am Mittwoch, 30. Dezember 2009 schrieben Sie:
> Could you try a more recent version of sane-backends, or perhaps a git
> snapshot?
>
> allan
>
> On Tue, Dec 29, 2009 at 5:34 AM, Rainer Dorsch <rdorsch at web.de> wrote:
> > Hello,
> >
> > when scanning with the Epson Perfection 610 with 150dpi color mode, sane
> > creates corrupted files
> >
> > rd at dell:~$ scanimage -L
> > device `epson2:libusb:001:003' is a Epson Perfection610 flatbed scanner
> > device `epson:libusb:001:003' is a Epson Perfection610 flatbed scanner
> > device `epkowa:libusb:001:003' is a Epson Perfection 610 flatbed scanner
> > Crd at dell:~$scanimage --device-name='epson2:libusb:001:003' --mode='Color'
> > -y 297 -l 0 --resolution='150' -x 210 --wait-for-button='yes' -t 0
> > --verbose > test.pnm
> > scanimage: scanning image of size 1240x1748 pixels at 24 bits/pixel
> > scanimage: acquiring RGB frame
> > scanimage: min/max graylevel value = 34/253
> > scanimage: read 6487680 bytes in total
> > rd at dell:~$ pnmtopng test.pnm > test.png
> > pnmtopng: EOF / read error reading a row of pixels
> > rd at dell:~$
> >
> > Also imagemagick has problems with this file
> >
> > rd at dell:~$ convert test.pnm test.png
> > convert: unable to read image data `test.pnm'.
> > convert: missing an image filename `test.png'.
> > rd at dell:~$ ls -l test.pnm
> > -rw-r--r-- 1 rd rd 6487717 29. Dez 10:40 test.pnm
> > rd at dell:~$
> >
> > For reference I put the corupted file to
> >
> > http://bokomoko.de/~rd/test.pnm
> >
> > Since kuickshow displays test.pnm well (also with more meaningfull
> > examples), I think sane scans the page ok, but has some issue when
> > writting the pnm file.
> >
> > When scanning with 300 dpi in color mode or 150 dpi in binary mode, there
> > is no issue:
> >
> > rd at dell:~$ scanimage --device-name='epson2:libusb:001:003' --mode='Color'
> > -y 297 -l 0 --resolution='300' -x 210 --wait-for-button='yes' -t 0
> > --verbose > test300.pnm
> > scanimage: scanning image of size 2480x3496 pixels at 24 bits/pixel
> > scanimage: acquiring RGB frame
> > scanimage: min/max graylevel value = 19/255
> > scanimage: read 26010240 bytes in total
> > rd at dell:~$ pnmtopng test300.pnm > test300.png
> > rd at dell:~$
> >
> > Again for reference: http://bokomoko.de/~rd/test300.pnm
> >
> > I am using the sane-backends version 1.0.19 contained in Debian 5.0
> >
> > Thanks,
> > Rainer
> >
> > --
> > sane-devel mailing list: sane-devel at lists.alioth.debian.org
> > http://lists.alioth.debian.org/mailman/listinfo/sane-devel
> > Unsubscribe: Send mail with subject "unsubscribe your_password"
> >             to sane-devel-request at lists.alioth.debian.org



-- 
Rainer Dorsch
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D-72135 Dettenhausen
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email: rdorsch at web.de
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