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

[el-ti]

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"
>
>
>