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

Sun Mar 20 09:55:01 UTC 2016

Wow! Amazing! That did the job – you should be paid by Canon! :-)

There’s only a little color strip (a yellow tint) at one side (for dpi 100-300; 400 and 600 don’t have it), but I guess, we have to live with that.

Really amazing! Thank you so much for your work!

See here: https://de.owncube.com/index.php/s/tJSe7f1Mlq7g1fG

el-ti

Am 20.03.2016 um 02:39 schrieb m. allan noah:
> Ok, after further digging, I think the margin and color problems are
> related. I have attached a new patch, please give it a try instead.
>
> allan
>
> On Sat, Mar 19, 2016 at 5:51 AM, el-ti <tl at ewetel.net> wrote:
> > 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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> >>>>>>>>>
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