[sane-devel] Problems with the canon backend for a canoscan 2700F.

[Henning Meier-Geinitz]

Hi,

On Tue, Jun 24, 2003 at 03:56:46PM +0200, Sigurd Stordal wrote:
> It will take a preview without problem, but when I choose scan in xsane, I get 
> a "failed to start scanner: invalid argument", error.  I get the same error 
> when trying xscanimage. Xsane 0.90, xscanimage 1.0.9. Sane-backends 1.0.12.
> Had previous problems with backend 1.0.10, giving strange colours in the 
> scanner, this has been fixed no, but no there is this error. could it be a 
> scsi problem.

I'm not a Canon expert, the canon backend maintainer may know more
details. But nevertheless some general hints:

* Make sure that you don't mix top-left and bottom-right coordinates.
  I don't know if that's possible with this frontend/backend
  combination but you never know. When you select what to scan, start
  with the top-left edge
* The difference between preview and actual scan is usually only the
  resolution and sometimes scan mode. So try some differnt resolutions
  and modes (if the backend supports that).
* Does scanimage show the same behaviour? E.g. try 
  "scanimage >image.pnm".
* You can enable debugging like this:
  SANE_DEBUG_CANON=255 xsane 2>logfile
  (and now scan an image and show us the logfile)
* If it's a SCSI problem, the SCSI adapter and kernel version you use
  may be of interest

Bye,
  Henning