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

[m. allan noah]

Did you install libusb-devel before you compiled sane-backends?

allan

On Wed, Mar 16, 2016 at 9:29 AM, el-ti <tl at ewetel.net> wrote:
> 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"
>> >>
>> >>
>> >>
>> >
>>
>>
>>
>



-- 
"well, I stand up next to a mountain- and I chop it down with the edge
of my hand"