NAME

       sane-hs2p - SANE backend for Ricoh SCSI flatbed/ADF scanners

DESCRIPTION

       The  sane-hs2p  library  implements  a SANE (Scanner Access Now Easy) backend that provides access to the
       Ricoh IS450 family of scanners. Should also work with the IS420, IS410, and IS430 scanners, but these are
       untested.  Please contact the maintainer or the sane-devel mailing list if you own such a scanner.

       This backend is alpha-quality. It may have bugs and some scanners haven't been tested at all. Be  careful
       and pull the plug if the scanner causes unusual noise.

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. The
       program sane-find-scanner helps to find out the correct device. Under Linux, such a device name could  be
       /dev/sg0 or /dev/sga, for example.  See sane-scsi(5) for details.

CONFIGURATION

       The  contents  of  the  hs2p.conf file is a list of device names that correspond to SCSI scanners.  Empty
       lines and lines starting with a hash  mark  (#)  are  ignored.   See  sane-scsi(5)  on  details  of  what
       constitutes a valid device name.

FILES

       @CONFIGDIR@/hs2p.conf
              The backend configuration file (see also description of SANE_CONFIG_DIR below).

       @LIBDIR@/libsane-hs2p.a
              The static library implementing this backend.

       @LIBDIR@/libsane-hs2p.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 @CONFIGDIR@.   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 "@CONFIGDIR@"
              being searched (in this order).

       SANE_DEBUG_HS2P
              If  the  library  was  compiled with debug support enabled, this environment variable controls the
              debug level for this backend.  A value of 255 prints all  debug  output.   Smaller  values  reduce
              verbosity.

CURRENT STATUS

       The  hs2p  backend  is now in version 1.00. All major scanning-related features are supported, except for
       those features requiring the optional IPU. Scanning from the flatbed or ADF (either simplex or duplex) is
       supported. Lineart, halftone, 4-bit gray, and 8-bit gray are supported. Pre-set gamma tables and halftone
       patterns are supported, as well as brightness, threshold, contrast.  Also supported is  scan  wait  mode,
       binary  and  gray filtering, negative scanning, and absolute or relative white setting. Printing with the
       optional endorser also is supported.

PLANNED FUNCTIONALITY

       This scanner can scan from the ADF in continuous simplex  mode.   Surprisingly,  many  scanners  scan  an
       entire document from the ADF into memory before ejecting the sheet. Thus if the document is too long, the
       scanner  cannot  hold the entire image data in memory.  But if the scanner would send its image data when
       its memory got full, and then read the  next  buffer's  worth  of  data,  continuous  scanning  could  be
       achieved.

MISSING FUNCTIONALITY

       The  SCSI  commands  for  uploading  (2AH)  or downloading (28H) custom halftone patterns (02H) and gamma
       vectors (03H) should work, but require implementing the SANE Option-Value  code  to  allow  the  user  to
       create the tables to be uploaded to the scanner. No support for Maintenance Data (80H) is planned as this
       functionality  is more suited to a stand-alone utility to be used by a technician when replacing the lamp
       or ADF unit. Nor is support for reading or changing IPU (93H) parameters and adjustments  planned,  since
       my IS450 lacks such a unit. The 31-byte Auto Photo/Letter struct and 21-byte Dynamic threshold struct are
       documented in the hs2p-scsi.h file should someone wish to use their IPU for image data processing.

SEE ALSO

       sane(7), sane-find-scanner(1), sane-scsi(5),

AUTHOR

       jeremy <jeremy@acjlaw.net>
       Maintained by Jeremy Johnson <jeremy@acjlaw.net>

@PACKAGEVERSION@                                   13 Jul 2008                                      sane-hs2p(5)