[sane-devel] Canon LiDE 220 - 4800 dpi scan has duplicated pixels in X direction

Stef stef.dev at free.fr
Tue Mar 22 20:22:15 UTC 2016

On 17/03/2016 08:56, Jonathan Liu wrote:
> Hi,
> I have opened the following ticket for 4800 dpi scanning on Canon LiDE 220:
> https://alioth.debian.org/tracker/index.php?func=detail&aid=315339&group_id=30186&atid=410366
> I just want to confirm, does this scanner support 4800 dpi x 4800 dpi
> scanning as indicated in the manufacturer specification? I was
> checking 4800 dpi scan in GIMP and I see blocks of 2 duplicated pixels
> in the X direction when scanned using SANE but not when using Canon
> ScanGear on Windows.
> Regards,
> Jonathan

     the backend has only 2400 optical dpi x 4800 motor dpi. Pixels are 
'doubled' to get proper aspect ratio for the result.
     I'll try to find some time  to do a wrireshark recording of a 
4800x4800 scan to check if it's possible to implement it in the genesys 


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