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

[el-ti]

Hello Allan,

I’m afraid, the cdr-55b didn’t change anything – although I don’t understand this. I also double checked: first I followed your instructions, but thenI unpacked the backends.tar.gz again to apply cdr-55b on the fresh files, because I wanted to make sure, I did not make a mistake. But even then, the scans returned the same results. Is that even possible?

See here: https://de.owncube.com/index.php/s/Dkqvp3O0hJEVPu7

best regards,
el-ti

Am 18.03.2016 um 12:53 schrieb m. allan noah:
> I have attached another patch. We will have to remove the first one,
> and add this new one to the source code directory you made before:
>
> 1. Change into the source directory (update name as required)
> cd sane-backends-gitXXXXXX/
>
> 2. Remove the old patch (update location as required, perhaps also ~/Downloads)
> cat ~/Downloads/cdr-55a.diff | patch -p1 -R
>
> 3. Apply the new patch (update location as required, perhaps also ~/Downloads)
> cat ~/Downloads/cdr-55b.diff | patch -p1
>
> 4. Rebuild, reinstall
> make
> sudo make install
>
> 5. Test again.
>
> allan
>
>
> On Fri, Mar 18, 2016 at 6:04 AM, el-ti <tl at ewetel.net> wrote:
> > Oh, I see!
> >
> > Now I did the scans again, each time power cycling the scanner:
> >
> > 1. Power on scanner.
> > 2. Plug scanner in.
> > 3. Start gscan2pdf.
> > 4. Adjust settings and scan and save.
> > 5. Quit gscan2pdf.
> > 6. Plug out scanner.
> > 7. Power off scanner.
> >
> > You can find the results here:
> > https://de.owncube.com/index.php/s/wQuYx6dkz5D8Gau
> >
> > As far as I can see, nothing changed to the previous test. Hope this helps.
> >
> > el-ti
> >
> >
> > Am 17.03.2016 um 12:20 schrieb m. allan noah:
> >> Yes, the patch changed something, you can look at it and see what it
> >> did, it is fairly small. The problem is that I don't think it should
> >> have changed 240, so if you are seeing a behavior change there, we
> >> need to do further investigation. So, I will be more explicit:
> >>
> >> Please make another set of scans, the same as you last did, but turn
> >> the scanner off and back on between each scan. Presumably you will
> >> have to stop and restart your scanning program too. I want to see if
> >> the earlier scans somehow pollute the later ones.
> >>
> >> After that, I will walk you thru adjusting the code, and we will try again.
> >>
> >> allan
> >>
> >> On Thu, Mar 17, 2016 at 4:28 AM, el-ti <tl at ewetel.net> wrote:
> >>> Hmmm, but the patch changed something, didn’t it? Without the patch 300dpi was wrong colors, now 300dpi is good. Unfortunately now 240dpi is wrong.
> >>>
> >>> If it’s too much work to get it running, It’s maybe okay, I normally do color scans with 300dpi. But I would probably consider getting rid of this model.
> >>>
> >>> If by power cycling you mean turning the scanner off and on, before using it (after installing the patched version) – yes, I always do that.
> >>>
> >>> best regards,
> >>> el-ti
> >>>
> >>>
> >>> Am 16.03.2016 um 22:11 schrieb m. allan noah:
> >>>> My patch did not change anything about 240dpi, since you said that was
> >>>> already working. I think perhaps there is something else going on
> >>>> here. Can you power cycle the scanner after each test?
> >>>>
> >>>> allan
> >>>>
> >>>> On Wed, Mar 16, 2016 at 1:45 PM, el-ti <tl at ewetel.net> wrote:
> >>>>> Oh! Mea culpa – I missed that point. But now the scanner works again,
> >>>>> and the behavior changed!  – That’s the good news. Not so good news is,
> >>>>> that now I have the following:
> >>>>>
> >>>>> Resolutions 300 and 600 have the right colors.
> >>>>>
> >>>>> Scanning with 100,150, 200 and 400 is now:
> >>>>> Blue -> Green
> >>>>> Green -> Red
> >>>>> Red -> Blue
> >>>>>
> >>>>> Scanning with 240 is now:
> >>>>> Blue -> Red
> >>>>> Red -> Green
> >>>>> Green -> Blue
> >>>>>
> >>>>> I don’t know if it helps, but I created a pdf document with scans in
> >>>>> color mode of the same page with the different resolutions in ascending
> >>>>> order: 100,150,200,240,300,400,600
> >>>>>
> >>>>> You can get it here:
> >>>>> https://de.owncube.com/index.php/s/KaSuVc4vRFWdOk4
> >>>>>
> >>>>> What you can also see there, is that there is a color strip on the left
> >>>>> side and that the page is a bit shifted horizontally – but this is not
> >>>>> our discussed problem at the moment.
> >>>>>
> >>>>> I hope this helps you.
> >>>>>
> >>>>> Thanks!
> >>>>> el-ti
> >>>>>
> >>>>> Am 16.03.2016 um 15:01 schrieb 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"
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>
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