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

Wed Mar 16 13:29:24 UTC 2016

All right, I’m pretty sure I got everything right, but surprisingly the scanner is not detected anymore... ("scanimage -L" only gives back the internal notebook camera) – is it even possible, that this is caused by the steps above? Or did I do something wrong?

Sorry for all the work…

Am 16.03.2016 um 13:24 schrieb m. allan noah:
> 1. Download sane-backends-git snapshot from:
> http://www.sane-project.org/snapshots/
>
> 2. In a terminal, cd to the directory where you downloaded the file
> (perhaps ~/Downloads)
> cd ~/Downloads
>
> 3. Extract the file (update name as required)
> tar xzf sane-backends-gitXXXXXXXX.tar.gz
>
> 4. Change into the source directory (update name as required)
> cd sane-backends-gitXXXXXX/
>
> 5. Apply the patch (update location as required, perhaps also ~/Downloads)
> cat ~/Downloads/cdr-55a.diff | patch -p1
>
> 6. Then you need to follow the instructions at
> http://www.sane-project.org/README.linux That will have you installing
> an updated version of sane-backends in /usr/local, where it has a
> reduced change of causing problems for your system.
>
> Let me know if you have questions.
>
> allan
>
> On Wed, Mar 16, 2016 at 6:38 AM, el-ti <tl at ewetel.net> wrote:
> > Thank you very much for your work.
> >
> > Unfortunately, I have no experience with patching something like this so far. I did some research, though – seems to be quite doable. I’m familiar with the terminal etc. As I understand this, I have to apply the diff-file on the original file with the patch command. So far, so good – but I have no idea, which file it is. I couldn’t figure out by looking at the diff file.
> >
> > If you could tell, on which file I have to apply this, that would be great! Thanks!
> >
> > Tobias
> >
> >
> > Am 16.03.2016 um 01:33 schrieb m. allan noah:
> >> I have attached a patch for the sane-backends source code. This
> >> attempts to provide alternate color de-interlacing for your scanner.
> >> It does not attempt to fix any edge cropping issues. Let me know if
> >> you need more instructions.
> >>
> >> allan
> >>
> >> On Tue, Mar 15, 2016 at 7:59 PM, m. allan noah <kitno455 at gmail.com> wrote:
> >>> Canon scanners often have this variable interlacing at different
> >>> resolutions, so I am not surprised to see this. However, this
> >>> particular scanner has the weirdest interlacing that canon does. If
> >>> you can compile from source, I can send you some patches to try. See
> >>> http://www.sane-project.org/README.linux
> >>>
> >>> allan
> >>>
> >>> On Tue, Mar 15, 2016 at 9:17 AM, el-ti <tl at ewetel.net> wrote:
> >>>> 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
> >>>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> --
> >>>>>>>> sane-devel mailing list: sane-devel at lists.alioth.debian.org
> >>>>>>>> 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
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>
> >>>
> >>>
> >>> --
> >>> "well, I stand up next to a mountain- and I chop it down with the edge
> >>> of my hand"
> >>
> >>
> >>
> >
>
>
>