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>