Provided by: libsane-common_1.1.1-5ubuntu1_all bug


       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 the path-name for the special device that corresponds to a SCSI scanner.
       The program sane-find-scanner(1) 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.   On  *NIX  systems,  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 verbosity.


       The sane-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.


       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.


       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


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


       jeremy <>
       Maintained by Jeremy Johnson <>

                                           13 Jul 2008                               sane-hs2p(5)