sane-agfafocus(5)         (10 Jul 2008)         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@alioth-lists.debian.net. Have a look at
          http://www.sane-project.org/mailing-lists.html concerning
          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 corresponds to a SCSI scanner. For SCSI scanners, the
          special device name must be a generic SCSI device or a sym-
          link 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

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          and lines starting with a hash mark (#) are ignored.  A sam-
          ple 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 direc-
               tories 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 direc-
               tory separator character, then the default directories
               are searched after the explicitly specified directo-
               ries.  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 information
                6       print less important information

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                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 imple-
          mented, 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 a terminal 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 prob-
          lem. Then send me a report with the log attached.

          If you encounter a SCSI bus error or trimmed and/or dis-
          placed 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 scanners.  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 support
               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 compliant backend.

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

     AUTHOR
          Ingo Schneider and Karl Anders [/O]ygard.

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