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 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
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
/opt/local/etc/sane.d/hs2p.conf
The backend configuration file (see also description of
SANE_CONFIG_DIR below).
/opt/local/lib/sane/libsane-hs2p.a
The static library implementing this backend.
/opt/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
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
/opt/local/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
/opt/local/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 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.
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)
sane-backends 1.2.1 - Generated Sat Feb 25 15:28:48 CST 2023