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


       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.


       This backend expects device names of the form:


       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.


       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.


              The   backend   configuration  file  (see  also  description  of
              SANE_CONFIG_DIR below).

              The static library implementing this backend.

              The shared library implementing this backend (present on systems
              that support dynamic loading).


              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).

              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


       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


       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


       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)
       paramters 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.


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


       jeremy <>
       Maintained by Jeremy Johnson <>

                                  13 Jul 2008                     sane-hs2p(5)