[sane-devel] Feedback Canon MG7750 / PIXMA backend

FS knarf at stulle-hamburg.de
Fri Apr 1 20:24:42 UTC 2016

Hi Rolf,
thank you for the patch. Now all resolutions up to 2400dpi give a 
correct result.

At the moment I have no further observations to report.
If you want me to perform some extra tests, please let me know.


Am 31.03.2016 um 11:19 schrieb Rolf Bensch:
> Hi Frank,
> I attached a patch for this issue. You need to patch the file
> "backend/pixma_mp150.c".
> Please report your results.
> Many thanks for your help.
> Cheers,
> Rolf
> Am 25.03.2016 um 13:25 schrieb FS:
>> Hi all,
>> I recently bought a Canon MG7750. And I was rather badly surprised by
>> Canons own scanner driver for Linux.
>> Hence, first and foremost a big thank you to the SANE developers for
>> adding support for this model.
>> Since you asked for testers I made some scans with different settings.
>> All resolutions up to 600DPI work fine (http://susepaste.org/350ec6bf ).
>> 1200DPI and 2400DPI work but the result looks rather strange
>> (=unusable) (http://susepaste.org/a7dbf6b8 and
>> http://susepaste.org/1ac92632 ).
>> All three files should show exactly the same picture.
>> For scanning only the resolution changed. No other setting was changed.
>> To reduce file size I compressed the images pretty strongly before
>> uploading. The 2400DPI scan is also reduced in resolution.
>> Hence, quality is well below the real scan quality.
>> But the problem is clearly visible.
>> SANE backends are from sane-backends-git20160322. OS is openSUSE
>> Leap42.1.
>> I hope this information helps. I will be happy to test newer versions
>> or tell you more information.
>> Cheers
>> Frank

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