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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) back-
       end  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	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.

CONFIGURATION
       The  contents of	the hs2p.conf file is a	list of	device names that cor-
       respond 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
       /usr/local/etc/sane.d/hs2p.conf
	      The  backend  configuration  file	 (see  also   description   of
	      SANE_CONFIG_DIR below).

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

       /usr/local/lib/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.  On *NIX systems, the	direc-
	      tories are separated by a	colon (`:'), under OS/2, they are sep-
	      arated  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 /usr/lo-
	      cal/etc/sane.d.  If the value of the environment	variable  ends
	      with  the	directory separator character, then the	default	direc-
	      tories are searched after	the explicitly specified  directories.
	      For example, setting SANE_CONFIG_DIR to "/tmp/config:" would re-
	      sult in directories tmp/config, ., and /usr/local/etc/sane.d be-
	      ing searched (in this order).

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

CURRENT	STATUS
       The sane-hs2p backend is	now in version 1.00.  All  major  scanning-re-
       lated  features	are supported, except for those	features requiring the
       optional	IPU. Scanning from the flatbed or ADF (either simplex  or  du-
       plex)  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.  Sur-
       prisingly, 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  re-
       quire implementing the SANE Option-Value	code to	allow the user to cre-
       ate  the	 tables	 to be uploaded	to the scanner.	No support for Mainte-
       nance 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)  parame-
       ters  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)

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