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

[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