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 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
/etc/sane.d/hs2p.conf
The backend configuration file (see also description of
SANE_CONFIG_DIR below).
/usr/lib/arch_triplet/sane/libsane-hs2p.a
The static library implementing this backend.
/usr/lib/arch_triplet/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
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).
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>
13 Jul 2008 sane-hs2p(5)
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