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

[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
>> >>
>> >
>> >
>> > --
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>>
>>
>>
>



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