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LEARN ABOUT NETBSD

sane-hs2p

sane-hs2p(5)						   SANE Scanner Access Now Easy 					      sane-hs2p(5)

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  mail-
       ing 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

       /etc/sane.d/hs2p.conf
	      The backend configuration file (see also description of SANE_CONFIG_DIR below).

       /usr/lib64/sane/libsane-hs2p.a
	      The static library implementing this backend.

       /usr/lib64/sane/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 configura-
	      tion 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 explic-
	      itly 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_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  mem-
       ory before ejecting the sheet. Thus if the document is too long, the scanner cannot hold the entire image data in memory.  But if the scan-
       ner 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) 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.

SEE ALSO

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

AUTHOR

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

								    13 Jul 2008 						      sane-hs2p(5)