sane-project-backends/doc/sane-hp.man

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.TH sane-hp 5 "09-July 2000"
.IX sane-hp
.SH NAME
sane-hp - SANE backend for HP ScanJet scanners
.SH DESCRIPTION
The
.B sane-hp
library implements a SANE (Scanner Access Now Easy) backend that
provides access to HP ScanJet scanners. At present, the following
scanners are known positively to work with this backend:
.PP
.RS
Model: Product id: Interface:
.br
---------- ----------- ----------
.br
ScanJet Plus C9195A HP Parallel Interface Card
.br
ScanJet IIc C1750A 3226 SCSI
.br
ScanJet IIcx C2500A 3332 SCSI
.br
ScanJet IIp C1790A SCSI
.br
ScanJet 3C C2520A 3503 SCSI
.br
ScanJet 3P C2570A 3406 SCSI
.br
ScanJet 4C C2520A SCSI
.br
ScanJet 4P C1130A 3540 SCSI
.br
ScanJet 4100C C6290A USB
.br
ScanJet 5P C5110A SCSI
.br
ScanJet 5100C C5190A parallel port
.br
ScanJet 5200C C7190A 3846 parallel port/USB
.br
ScanJet 6100C C2520A 3644 SCSI
.br
ScanJet 6200C C6270A 3828 SCSI/USB
.br
ScanJet 6250C C6270A 3828 SCSI/USB
.br
ScanJet 6300C C7670A SCSI/USB
.br
ScanJet 6350C C7670A SCSI/USB
.br
PhotoSmart C5100A R029,R030,R032 SCSI
.RE
.PP
Support for models 5100C/5200C connected to the parallel port requires
the ppSCSI driver available at http://www.torque.net/parport/ppscsi.html
(under development)
.PP
Support for models 5200C/6200C/6250C/6300C/6350C connected to the USB requires
an USB driver available at http://www.jump.net/~dnelson/linux/usb
(under development)
.PP
If you own a ScanJet scanner other than the ones listed above, please
let us know if your model works with this backend. To do this, send a
mail with the relevant information for your scanner to
.IR sane\-devel@mostang.com .
.SH "DEVICE NAMES"
This backend expects device names of the form:
.PP
.RS
.I special
.RE
.PP
Where
.I special
is the UNIX path-name for the special device that corresponds to the
scanner. For SCSI scanners the special device name must be a generic SCSI
device or a symlink to such a device. Under Linux, such a device name could be
.I /dev/sga
or
.IR /dev/sge ,
for example. For the Hp ScanJet Plus the special device name must be the device
that corresponds to the parallel interface card that was shipped with the
scanner. That is
.I /dev/hpscan
A special driver is required for this card.
See ftp://rvs.ctrl-c.liu.se/pub/wingel/hpscan for details. If the link
does not work, try ftp://sunsite.unc.edu/pub/Linux/kernel/patches/scanners.
.SH CONFIGURATION
The contents of the
.I hp.conf
file is a list of options and device names that correspond to HP ScanJet
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.
.PP
Options specified infront of the first line that keeps a device name
are defaults for all devices. Options specified below a line that
keeps a device name apply just to the most recently mentioned device.
.PP
Supported options are
.BR connect-scsi ,
.BR connect-device
and
.BR enable-image-buffering .
Option
.B connect-scsi
specifies that the scanner is connected to the system by SCSI.
Input/output is performed using SCSI-commands.
This is the default.
Option
.B connect-device
specifies that the scanner is connected to the system by a special
device. Input/output is performed by read()/write()-operations
on the device. This option must be used for HP ScanJet Plus.
Option
.B enable-image-buffering
stores the scanned image in memory before passing it to the frontend. Could be
used in case of forward/backward moving scanner.
.PP
A sample configuration file is shown below:
.PP
.RS
/dev/scanner
.br
# this is a comment
.br
/dev/hpscan
.br
option connect-device
.RE
.SH FILES
.TP
.I @CONFIGDIR@/hp.conf
The backend configuration file (see also description of
.B SANE_CONFIG_DIR
below).
.TP
.I @LIBDIR@/libsane-hp.a
The static library implementing this backend.
.TP
.I @LIBDIR@/libsane-hp.so
The shared library implementing this backend (present on systems that
support dynamic loading).
.TP
.I $HOME/.sane/calib-hp:<device>.dat
Calibration data for HP PhotoSmart PhotoScanner that is retrieved from the
scanner after calibration. The data is uploaded to the scanner at start
of the backend if it is in media mode 'print media' or if the media mode is
changed to 'print media'.
.SH ENVIRONMENT
.TP
.B 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 @CONFIGDIR@. 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
.B SANE_CONFIG_DIR
to "/tmp/config:" would result in directories "tmp/config", ".", and
"@CONFIGDIR@" being searched (in this order).
.TP
.B SANE_DEBUG_HP
If the library was compiled with debug support enabled, this
environment variable controls the debug level for this backend. E.g.,
a value of 128 requests all debug output to be printed. Smaller
levels reduce verbosity.
.SH BUGS
.TP
.B HP PhotoSmart PhotoScanner
In media mode 'slide' and 'negative', scan resolutions are rounded to
multiple of 300 dpi. The scanner does not scale the data correctly
on other resolutions. Some newer models (firmware code R030 and later)
do not support adjustment of contrast/intensity level and tone map.
The backend will simulate this by software, but only for gray
and 24 bit color.
.TP
.B Automatic Document Feeder (ADF)
For use of the ADF with xscanimage(1), first place paper in the ADF and
then change option scan source to 'ADF'. Press 'change document'
to load a sheet. Then press 'scan' to start a scan.
Maybe it is sufficient to press 'scan' without 'change document'
for repeated scans. The use of the preview window is not recommended
when working with the ADF.
.TP
.B Immediate actions
Some actions in xscanimage(1) (i.e. unload, select media, calibrate)
have an immediate effect on the scanner without starting a scan.
These options can not be used with scanimage.
.SH TODO
.TP
.B HP PhotoSmart PhotoScanner
PhotoScanners with firmware release R030 and up have
no firmware support for contrast/brightness/gamma table. In the current
backend this is simulated by software on 24 bits data.
Simulation on 30 bits should give better results.
.TP
.B Parallel scanner support
Beside the ScanJet Plus which came with its own parallel interface card,
currently only the HP ScanJet 5100C/5200C are supported.
These scanners are using an internal parallel-to-SCSI converter which
is supported by the ppSCSI-driver (see above).
.SH "SEE ALSO"
sane\-scsi(5)
.SH AUTHOR
The sane-hp backend was written by Geoffrey T. Dairiki. HP PhotoSmart
PhotoScanner support by Peter Kirchgessner.