[sane-devel] Image of scanned ,document is split in two

[Thierry HUCHARD]

Hi,

can you open an issue at this address 
(https://gitlab.com/sane-project/backends/)?
The maintainer of the backend will be able to look at your problem.

Thierry

Le 2020-08-14 01:21, Torbjörn Stabo a écrit :
> Hi. Thanks for answering.
> 
> sane updated, versions before/after for info:
> $ apt list --upgradable
> Listar… Färdig
> libsane-common/focal,focal 1.0.30+git20200809-focal0 all
> [uppgraderingsbart från: 1.0.29-0ubuntu5]
> libsane/focal 1.0.30+git20200809-focal0 amd64 [uppgraderingsbart från:
> 1.0.29-0ubuntu5]
> sane-utils/focal 1.0.30+git20200809-focal0 amd64 [uppgraderingsbart
> från: 1.0.29-0ubuntu5]
> 
> And here's the scanimage output:
> $ scanimage -L
> device `pixma:04A9173C' is a CANON Canon PIXMA MP490 multi-function 
> peripheral
> /Regards, Torbjörn Stabo
> 
> Den 2020-08-14 kl. 00:14, skrev Thierry HUCHARD:
>> Hi Torbjörn,
>> 
>> Can you update your sane version?
>> 
>> $ sudo add-apt-repository ppa:rolfbensch/sane-git
>> $ sudo apt-get update
>> $ sudo apt install libsane libsane-common sane-utils
>> 
>> Can you provide the log of this command?
>> 
>> $ scanimage -L
>> 
>> Thierry
>> 
>> Le 2020-08-13 22:52, Torbjörn Stabo a écrit :
>>> Hi.
>>> 
>>> I asked about this in #sane and was told to go here.
>>> 
>>> I am using xsane 0.999 in kubuntu 20.04. When I try to load settings
>>> for my scanner using that GUI the scanner is called CanonPIXMAMP490.
>>> 
>>> $ scanimage --version
>>> scanimage (sane-backends) 1.0.29; backend version 1.0.29
>>> 
>>> Now, the problem is that even though I put *one* paper in the scanner
>>> the result image that is shown in xsane contains *two* papers! The
>>> papers are next to eachother in the image, kind of "occupying half 
>>> the
>>> width" each. They're not perfect(it was quite visible when I scanned 
>>> a
>>> photo with persons in it), each paper is half as wide as it should 
>>> be.
>>> If I scale the image and double its width things look much better.
>>> It's like the two papers should be "interlaced" with eachother to
>>> create the correct scan image.
>>> 
>>> Not sure if I can draw this in ascii:
>>> 
>>> Result image:
>>> 
>>> -----------------------
>>> | --------- --------- |
>>> | | Half  | | Half  | |
>>> | | width | | width | |
>>> | | paper | | paper | |
>>> | |       | |       | |
>>> | --------- --------- |
>>> -----------------------
>>> 
>>> Scaled version of result image, doubled width:
>>> 
>>> -----------------------
>>> | ------------------- |
>>> | | Full            | |
>>> | | width           | |
>>> | | paper           | |
>>> | |                 | |
>>> | ------------------- |
>>> -----------------------
>>> 
>>> Does anyone here know what is causing this? And how to get rid of 
>>> that
>>> "interlace effect"? Of course scaling the image is a satisfactory
>>> workaround for me, though I'm not sure the result is pixel perfect.
>>> 
>>> Thanks in advance.
>>> 
>>> /Regards, Torbjörn Stabo