[sane-devel] Colour problem with Canon Maxify MB5150

[Thierry Huchard]

Hi Rainer,
The current version of scangearmp2 is 4.10 ( https://canoncanadafr.custhelp.com/app/answers/answer_view/a_id/1034243/~/scangear-mp-v.-4.10-for-linux-%28debian-packagearchive%29).
You can install libmfo2-canon (https://github.com/Ordissimo/libmfp2-canon),  which will allow you to use your device with xsane.
I have not finished, the Flatbed, works, I plan to add the 600dpi.
For the ADF, only the first page is taken but I'll fix that after the vacations.

Thierry

Le 2 août 2021 11:27:38 GMT+02:00, Dr Rainer Woitok <rainer.woitok at gmail.com> a écrit :
>Ralph and Others,
>
>On Wednesday, 2021-06-30 12:07:49 +0200, I myself wrote:
>
>> Ralph,
>> 
>> On Wednesday, 2021-05-19 18:21:57 -0700, you wrote:
>> 
>> > ...
>> > On 2021-05-19 8:46 a.m., Dr Rainer Woitok wrote:
>> > > ...
>> > >   - The PNG file from the flatbed clearly showed the original paper hav-
>> > >     ing been rather thin, since some colours from the reverse side shone
>> > >     slightly through, and the background colour having been faintly grey
>> > >     rather than white.   In other words, this PNG file was a fairly good
>> > >     copy of the original.
>> > >
>> > >   - But the PNG file from the ADF did show almost no shine through and a
>> > >     more or less purely white background.  Dark colours appeared slight-
>> > >     ly darker and light colours slightly lighter than the original.  The
>> > >     effect was somewhat similar to using ImageMagick's "-normalize" opt-
>> > >     ion.
>> > > ...
>> > Some of the pixma devices seems to have a completely different engine
>> > for generating scans from the ADF compared to the flatbed.
>> > For ADF, they return JPEG data to SANE instead of the normal raster data
>> > that we get from flatbed.
>> > I have no idea why that would be the case but they do use the same sensors.
>> 
>> I have meanwhile opened a support case with Canon  complaining about the
>> low quality of ADF scans.   In their response Canon pointed out that ADF
>> (at least normally) is optimized for speed rather than quality and sugg-
>> ested testing with  "IJ Scan Utility"  using the various settings of the
>> "Advanced Mode" provided by "ScanGear".   So I reanimated my old Windows
>> Vista laptop,  installed "IJ Scan Utility" from the Canon CD and started
>> it.
>> 
>> I selected "Document (ADF Simplex)", "A4",  and "Color" in the input and
>> "300 dpi" in the output section,  and under "Image Settings" I left "Im-
>> age Adjustment" at "Document"  and set "Unsharp Mask"  and "Descreen" to
>> "OFF" and "Reduce Dust and Scratches"  and "Grain Corretcion" to "None".
>> Hitting "Scan" I eventually obtained file "ScanGear-ADF-Doc.png".
>> 
>> In the second run I just changed  "Image Adjustment" to "None" (the only
>> alternative offered) and scanned to file "ScanGear-ADF-None.png".
>> 
>> Finally,  I changed the Source to "Platen"  which forced "Paper Size" to
>> "Full Platen"  and "Image Adjustment" to "None"  (greying both out), and
>> received file "ScanGear-Flatbed.png".
>> 
>> Here are the file sizes:
>> 
>>    $ ls -l ScanGear-*
>>    -rwx------ 1 rainer rainer  3324661 2021-06-29 15:48 ScanGear-ADF-Doc.png
>>    -rwx------ 1 rainer rainer 11142577 2021-06-29 15:49 ScanGear-ADF-None.png
>>    -rwx------ 1 rainer rainer 15357308 2021-06-29 15:49 ScanGear-Flatbed.png
>>    $
>> 
>> Files "ScanGear-ADF-Doc.png"  and "ScanGear-Flatbed.png"  are similar in
>> size and quality to the files I originally obtained using "scanimage" on
>> Linux,  while the quality of file  "ScanGear-ADF-None.png" is comparable
>> to that of  "ScanGear-Flatbed.png".   So setting  "Image Adjustment"  to
>> "None" in the "ScanGear" GUI  does produce a decent ADF scan  on the MB-
>> 5150.   Now we "just" need to get the same result  from the "pixma"back-
>> end ...
>> 
>> By the way: On their web site at
>> 
>>    https://www.canon-europe.com/support/consumer_products/products/fax__multifunctionals/inkjet/maxify_mb_series/maxify_mb5150.html?type=drivers&language=en&os=linux%20(64-bit)
>> 
>> Canon is offering the source code for both, an IJ Printer Driver version
>> 5.40 and ScanGear MP version 3.40, of which the former is even available
>> as Gentoo package "net-print/cnijfilter2"  version 5.90.  Would these be
>> of any help?
>> 
>> Sincerely,
>>   Rainer
>
>However, up to now I never received an answer.  Did I just miss it or is
>there really nothing  to be done  to make  _scanner access now easy_ for
>the Canon Maxify MB5150?
>
>Sincerely,
>  Rainer
>

-- 
Envoyé de mon appareil Android avec Courriel K-9 Mail. Veuillez excuser ma brièveté.
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