[sane-devel] Canon DR-C125: Wrong colors when scanning Duplex

[el-ti]

Unfortunately, yes.

I uninstalled "cndrvsane-drc125" and restartet the system. The color shift is still there.

And there is also the problem, that there is a 1/2 cm cut on the long edge of the scanned page (the "duplex-offset" option only handles the short edge) – but I guess this is another problem.

If you need more information, do not hesitate to tell me.

el-ti

Am 15.03.2016 um 12:41 schrieb m. allan noah:
> If you uninstall the Canon "DR-C125 Driver for Linux V1.0 (v1.0)"
> software, does this color shift still happen?
>
> allan
>
> On Tue, Mar 15, 2016 at 7:37 AM, el-ti <tl at ewetel.net> wrote:
> > The system is using the libsane version from the PPA: 1.0.26-git20160305-wily0
> >
> > It was installed above the one from Ubuntu’s repositories, when I added the PPA.
> >
> > el-ti
> >
> > Am 15.03.2016 um 12:22 schrieb m. allan noah:
> >> You have installed both sane-backends, and canon's driver? Which one
> >> are you using? Assuming you are actually using sane-backends, we will
> >> have to modify the code to control the color descrambling.
> >>
> >> allan
> >>
> >> On Tue, Mar 15, 2016 at 6:08 AM, el-ti <tl at ewetel.net> wrote:
> >>> Hello,
> >>>
> >>> I have an appendix to make – maybe someone has a hint for me, why the
> >>> scanner behaves really strange:
> >>>
> >>> Depending on the scanning resolution, the shifting on the color range is
> >>> different! I used the following command to test this:
> >>>
> >>> scanimage --batch --source "ADF Duplex" --page-width 210
> >>> --page-height=297 -l 0 -t 0 -x 210 -y 297 --mode Color --resolution 300
> >>>
> >>> Then I tried all available resolutions: 100, 150, 200, 240, 300, 400,
> >>> 600. The results are strange:
> >>>
> >>> Scanning with 100,150,200 gives me:
> >>> Blue -> Red
> >>> Red -> Green
> >>> Green -> Blue
> >>>
> >>> Scanning with 300 and 400 gives me:
> >>> Blue -> Green
> >>> Green -> Red
> >>> Red -> Blue
> >>>
> >>> And scanning with 240 and 600 shows the RIGHT colors.
> >>>
> >>> How is that possible? And how can this problem be solved?
> >>>
> >>>
> >>> I installed Rolf Bensch’s PPA
> >>> (https://launchpad.net/~rolfbensch/+archive/ubuntu/sane-git), because it
> >>> solved the back page cutting problem when scanning Duplex. (see
> >>> http://permalink.gmane.org/gmane.comp.graphics.scanning.sane.devel/24903)
> >>>
> >>> Other than that, I only installed the Canon "DR-C125 Driver for Linux
> >>> V1.0 (v1.0)".
> >>>
> >>> Any hint is appreciated!
> >>> el-ti
> >>>
> >>> Am 04.03.2016 um 10:59 schrieb el-ti:
> >>>> Dear Sane-developers and users,
> >>>>
> >>>> through this very helpful discussion
> >>>> (http://permalink.gmane.org/gmane.comp.graphics.scanning.sane.devel/24903),
> >>>> I managed to get my Canon Scanner working in Duplex without cutting 1 cm
> >>>> of the back page.
> >>>>
> >>>> Everything seems to work fine. However, I discovered a very strange
> >>>> behaviour regarding the colour management: When scanning in simplex
> >>>> mode, everything works fine. There is no page cutting and colours are as
> >>>> they should be. But in duplex mode, the colours are somehow shifted on
> >>>> the colour range: Blue is scanned as green, green is scanned as red, red
> >>>> is scanned as blue (for both back and front page).
> >>>>
> >>>> Is there an easy solution for this? Or did I forget to install something?
> >>>>
> >>>> Thank you very much!
> >>>> el-ti
> >>>>
> >>>
> >>>
> >>> --
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> >>> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel
> >>> Unsubscribe: Send mail with subject "unsubscribe your_password"
> >>>              to sane-devel-request at lists.alioth.debian.org
> >>
> >>
> >>
> >
>
>
>