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

[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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