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

[el-ti]

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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>
>
>