[sane-devel] Canon DR-2580C - size recognition problems

[m. allan noah]

try setting using the page-width and page-height params before you set the x/y

allan


On Mon, Oct 31, 2011 at 1:39 PM, Max Voit <max.voit+mlsa at with-eyes.net> wrote:
> Hi,
>
> I've got some problems with the Canon DR-2580C scanner: It doesn't
> recognize the size of the paper(which is Din A4) correctly but cuts off
> the bottom.
>
> Setting the size via -x/-y doesn't work, since these values are
> reset to the predefined maximums (215, 279).
> In sum the front side is missing 1 to 2 cm at the bottom. Additionally
> the back side has a y-offset, so it starts about 2-3 cm late and is
> therefore missing 3-5 cm.
>
> Another thing is: The back side it slightly rotated even if the
> front page is all straight.
>
> Furthermore: Various(i.e. i tested all possible) combinations of swcrop,
> swdeskew and rollerdeskew do not work as expected. Especially deskew
> rotates the page (mostly the back side, as this is rotated slightly as
> mentioned above) into the wrong direction; so afterwards it's even more
> inclined than before.
>
> Still the last thing wouldn't be that a problem to me, since one could
> do that via some software after the scan. The main thing is the missing
> data at the bottom of the page.
>
> Mostly used scanimage; with different resolutions, modes, parameters
> for x,y,t,l and deskew-options. I tested some gui tools as well (though
> gscan2pdf seems to be the only one, supporting duplex; it shows those
> problems as well):
>
> scanimage --mode Gray --source "ADF Duplex" --resolution 200
> --batch-count=2 --batch=s%d.pnm
>
> Version information:
>
> (debian wheezy)
>
> :~$ dpkg --list | grep sane
> ii libsane
> 1.0.22-6                         API library for scanners
> ii libsane-common
> 1.0.22-6                         API library for
>        scanners -- documentation and support files
> ii libsane-extras
> 1.0.22.2                         API library for scanners -- extra
>        backends
> ii libsane-extras-common
> 1.0.22.2                         API library for scanners --
>        documentation and support files
> ii libsane-perl
> 0.03-1+b1                        Perl bindings for the SANE (Scanner
>        Access Now Easy) Project
> ii  sane-utils
> 1.0.22-6                         API library for scanners -- utilities
>
> :~$ scanimage -V
> scanimage (sane-backends) 1.0.22; backend version 1.0.22
>
> :~$ lsusb | grep Canon
> Bus 001 Device 046: ID 04a9:1608 Canon, Inc.
>
> I'd have attached a example scan consisting of front and back side
> (50kb each); not sure whether this 'd be ok on this list?
>
> Please let me know what more information would be needful or which
> tests i could do. Thanks for any help in advance.
>
> kind regards,
> Max
>
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