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

[Torbjörn Stabo]

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