sane-avision - SANE backend for original Avision and Avision OEM scanners
(HP, Minolta, Mitsubishi, UMAX and possibly more) flatbed scanners
ABOUT THIS FILE
This file only is a short descripton of the avision-backend for sane!
DESCRIPTION
The
sane-avision
library implements a SANE (Scanner Access Now Easy) backend that
provides access to Avision flatbed scanners and the Avision
OEM scanners labelled with HP and Minolta.
CONFIGURATION
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!
#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.
DEVICE NAMES
This backend expects device names of the form:
special
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.
FILES
/etc/sane.d/avision.conf
The backend configuration file (see also description of
SANE_CONFIG_DIR
below).
/usr/lib/sane/libsane-avision.a
The static library implementing this backend.
/usr/lib/sane/libsane-avision.so
The shared library implementing this backend (present on systems that
support dynamic loading).
ENVIRONMENT
SANE_CONFIG_DIR
This environment variable specifies the list of directories that may
contain the configuration file. Under UNIX, the directories are
separated by a colon (`:'), under OS/2, they are separated by a
semi-colon (`;'). If this variable is not set, the configuration file
is searched in two default directories: first, the current working
directory (".") and then in /etc/sane.d. If the value of the
environment variable ends with the directory separator character, then
the default directories are searched after the explicitly specified
directories. For example, setting
SANE_CONFIG_DIR
to "/tmp/config:" would result in directories "tmp/config", ".", and
"/etc/sane.d" being searched (in this order).
SANE_DEBUG_AVISION
If the library was compiled with debug support enabled, this
environment variable controls the debug level for this backend.
Higher debug levels increase the verbosity of the output. The debug
level 7 is the author's prefered value to debug backend problems.