[sane-devel] Pixma driver for MG7550 produces stripes

[Rolf Bensch]

Addendum:

Xsane sends a gamma table to the scanner, which is responsible for the
quality of the image.

Please correct me if I'm wrong, xsane also manipulates the brightness
and the contrast of the image.

Hope this helps.

Cheers,
Rolf

Am 18.08.2015 um 22:50 schrieb Rolf Bensch:
> Hi Martin,
>
> The backend isn't responsible for any artefacts, it handles the scanned
> data 1:1 to the saved image colour file. The Pixma backend only
> manipulates the images for grayscale and lineart (1 bit b/w) output formats.
>
> OK, there is some loss with image compression algorithms. If you have
> trouble with this, you should select lossless image formats.
>
> Maybe you should test different scan resolutions.
>
> Hope this helps.
>
> Cheers,
> Rolf
>
>
>
> Am 18.08.2015 um 13:32 schrieb Martin:
>> I noticed diagonal stripes on some scanned pictures.
>>
>> In order to verify that it is not on the picture but an artifact of sane
>> I scanned the same picture with Canon's scangear-progam on a
>> Windows-system. That picture does not have the stripes.
>>
>>  
>>
>> Please find the image scanned with xsane attached.
>>
>>  
>>
>> Cheers,
>>
>> Martin
>>
>>  
>>