This file only is a short descripton of the avision-backend for sane!
The configuration file for this backend resides in
/etc/sane.d/avision.conf.
Its contents is a list of device names that correspond to Avision and Avision compatible scanners and backend-options. Empty lines and lines starting with a hash mark (#) are ignored. A sample configuration file is shown below:
I suggest you hold one hand on the power-button of the scanner while you try the first scans!
# this is a comment
option force-a4
option disable-gamma-table
option disable-calibration
option one-calib-only
option old-calibration
#scsi Vendor Model Type Bus Channel ID LUN
scsi AVISION
scsi HP
/dev/scanner
- force-a4:
Forces the backend to overwrite the scanable area
returned by the scanner. This might be needed for
the AV 630 which returns no area - or newer scanners
which retun the area in a unkown format our backend
doesn't recongize yet.
- disable-gamma-table:
Disables the usage of the scanner's gamma-table. You
might try this if your scans hang or only produces
random garbage.
- disable-calibration:
Disables the scanner's color calibration. You
might try this if your scans hang or only produces
random garbage.
- one-calib-only:
When this option is enabled, the backend will only
perform a calibration when the backend is initialized
and not before each scan. This might extend the life
of the CCD, but does not work reliable with the newer
USB scanners (they hang sometimes or return garbage
image data). So this option should be used with care.
- old-calibration:
This enables the use of the old calibration code for
testing purposes.
Note: Any option above modifies the default code-flow
for your scanner. The options should only be used
when you encounter problems with the default be-
haviour of the backend. Please report the need of
options to the backend-author so the backend can
be fixed as soon as possible.
Where special is the path-name for the special device that corresponds to a SCSI scanner. The special device name must be a generic SCSI device or a symlink to such a device. The program sane-find-scanner helps to find out the correct device. Under Linux, such a device name could be /dev/sga or /dev/sge, for example. See sane-scsi(5) for details.
Note: Since the backend does only use the scsi interface
for scanner access, you need a scsi emulation for
USB devices such as the HP 5300, HP 7400 or Minolta
film-scanners. The kernel module is named hpusbscsi
and present in the latest 2.4 and 2.5 kernels.
Example: export SANE_DEBUG_AVISION=7