sane-agfafocus(5)	 SANE Scanner Access Now Easy	     sane-agfafocus(5)



NAME
       sane-agfafocus - SANE backend for AGFA Focus flatbed scanners

DESCRIPTION
       The  sane-agfafocus library implements a SANE (Scanner Access Now Easy)
       backend that  provides  access  to  AGFA	 Focus	flatbed	 scanners.  At
       present, the following scanners are supported from this backend:

	      AGFA Focus GS Scanner (6 bit gray scale) (untested)
	      AGFA Focus Lineart Scanner (lineart) (untested)
	      AGFA Focus II (8 bit gray scale) (untested)
	      AGFA Focus Color (24 bit color 3-pass)
	      AGFA Focus Color Plus (24 bit color 3-pass)

	      Siemens S9036 (8 bit gray scale) (untested)

       The driver supports line art, 6bpp and 8bpp gray, 18bpp and 24bpp color
       scans.

       If you own a scanner other than the ones listed above that  works  with
       this  backend,  please let us know by sending the scanner's model name,
       SCSI id, and firmware revision  to  sane-devel@lists.alioth.debian.org.
       Have  a look at http://www.sane-project.org/mailing-lists.html concern-
       ing subscription to sane-devel.

       All of these scanners are pre-SCSI-2, and do not even  report  properly
       to  SCSI	 Inquiry.   This is typically evident in SCSI bus scans, where
       the scanner will come  up  with	only  garbage  as  vendor  and	models
       strings.


DEVICE NAMES
       This backend expects device names of the form:

	      special

       Where  special is either the path-name for the special device that cor-
       responds to a SCSI scanner. For SCSI scanners, the special device  name
       must  be	 a  generic  SCSI device or a symlink to such a device.	 Under
       Linux, such a device name could be /dev/sga or /dev/sge,	 for  example.
       See sane-scsi(5) for details.

CONFIGURATION
       The  contents of the agfafocus.conf file is a list of device names that
       correspond to AGFA Focus scanners.  Empty lines and lines starting with
       a  hash	mark  (#)  are	ignored.  A sample configuration file is shown
       below:

	      /dev/scanner
	      # this is a comment
	      /dev/sge


FILES
       /etc/sane.d/agfafocus.conf
	      The  backend  configuration  file	 (see  also   description   of
	      SANE_CONFIG_DIR below).

       /usr/lib/libsane-agfafocus.a
	      The static library implementing this backend.

       /usr/lib/libsane-agfafocus.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 config-
	      uration 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	 sepa-
	      rator 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_AGFAFOCUS
	      If  the  library	was  compiled with debug support enabled, this
	      environment variable controls the debug level for this  backend.
	      E.g.,  a	value  of 128 requests all debug output to be printed.
	      Smaller levels reduce verbosity.	SANE_DEBUG_AGFAFOCUS values:


	      Number  Remark

	       0       print important errors (printed each time)
	       1       print errors
	       2       print sense
	       3       print warnings
	       4       print scanner-inquiry
	       5       print informations
	       6       print less important informations
	       7       print called procedures
	       8       print reader_process messages
	       10      print called sane-init-routines
	       11      print called sane-procedures
	       12      print sane infos
	       13      print sane option-control messages


MISSING FUNCTIONALITY
       Uploading of dither matrices and tonecurves has been  implemented,  but
       so far has not proven to be useful for anything.	 For this reason these
       options have been disabled.


BUGS
       The scanners that do not support disconnect  have  problems  with  SCSI
       timeouts	 if  the SCSI bus gets loaded, eg. if you do a kernel build at
       the same time as scanning.  To see if your scanner supports disconnect,
       run  "SANE_DEBUG_AGFAFOCUS=128  scanimage  -L"  in  sh and look for the
       "disconnect:" line)


DEBUG
       If you have problems with SANE not detecting your  scanner,  make  sure
       the  Artec  backend is disabled.	 Somehow, this backend causes at least
       my scanner not to respond correctly to SCSI inquiry commands.

       If  you	encounter  a  bug  please   set	  the	environment   variable
       SANE_DEBUG_AGFAFOCUS  to	 128  and  try to regenerate the problem. Then
       send me a report with the log attached.

       If you encounter a SCSI bus error or trimmed  and/or  displaced	images
       please  also  set the environment variable SANE_DEBUG_SANEI_SCSI to 128
       before sending me the report.


TODO
       More scanners?

	      The AGFA ACS and ARCUS scanners are similar to the  FOCUS	 scan-
	      ners.   The  driver  could probably be extended to support these
	      scanners without too many changes.  I do not have access to such
	      scanners, and cannot add support for it.	However, if you are in
	      possession of such a scanner, I could be helpful in adding  sup-
	      port for these scanners.

	      The  AGFA	 HORIZON  scanners  are	 SCSI-2 scanners, and it would
	      probably be easier to support these scanners in a SCSI-2 compli-
	      ant backend.

SEE ALSO
       sane(7), sane-scsi(5)


AUTHOR
       Ingo Schneider and Karl Anders Oygard.




sane-backends 1.0.18		  17 Oct 1998		     sane-agfafocus(5)