sane-hp(5) SANE Scanner Access Now Easy sane-hp(5)NAMEsane-hp - SANE backend for HP ScanJet scanners
DESCRIPTION
The sane-hp library implements a SANE (Scanner Access Now
Easy) backend that provides access to HP ScanJet scanners
which support SCL (Scanner Control Language by HP). The
following scanners are known positively to work with this
backend:
Model: Product id: Interface:
-------------------------------
ScanJet Plus C9195A HP Parallel Inter-
face Card
ScanJet IIc C1750A 3226 SCSI
ScanJet IIcx C2500A 3332 SCSI
ScanJet IIp C1790A SCSI
ScanJet 3C C2520A 3503 SCSI
ScanJet 3P C2570A 3406 SCSI
ScanJet 4C C2520A SCSI
ScanJet 4P C1130A 3540 SCSI
ScanJet 4100C C6290A USB
ScanJet 5P C5110A SCSI
ScanJet 5100C C5190A parallel port
ScanJet 5200C C7190A 3846 parallel port/USB
ScanJet 6100C C2520A 3644 SCSI
ScanJet 6200C C6270A 3828 SCSI/USB
ScanJet 6250C C6270A 3828 SCSI/USB
ScanJet 6300C C7670A SCSI/USB
ScanJet 6350C C7670A SCSI/USB
ScanJet 6390C C7670A SCSI/USB
PhotoSmart C5100A R029,R030,R032 SCSI
Support for models 5100C/5200C connected to the parallel
port requires the ppSCSI driver available at
http://www.torque.net/parport/ppscsi.html (under develop-
ment)
Support for models 5200C/62X0C/63X0C connected to the USB
require the kernel scanner driver or libusb. See sane-
usb(5) for more details.
The "hp" backend no longer supports OfficeJet multi-func-
tion peripherals. For these devices use the external
"hpoj" backend in version 0.90 and later of the "HP
OfficeJet Linux driver", available at
http://hpoj.sourceforge.net
Because Hewlett-Packard does no longer produce scanners
that support SCL (beside the OfficeJets), the above list
of supported scanners is complete. Other HP scanners are
not supported by the "hp" backend, but might be supported
by another one. See http://www.mostang.com/sane. You can
also watch the sane-devel mailinglist at
http://www.mostang.com/sane/mail.html.
More details about the hp backend can be found on its
homepage http://www.kirchgessner.net/sane.html.
DEVICE NAMES
This backend expects device names of the form:
special
Where 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 /dev/sga or /dev/sg2, for example. If the special
device name contains "usb", "uscanner" or "ugen", it is
assumed that the scanner is connected by USB. 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 /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/ker-
nel/patches/scanners.
CONFIGURATION
The contents of the 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) and sane-usb(5) on details of
what constitutes a valid device name.
Options specified in front of the first line that contains
a device name are defaults for all devices. Options speci-
fied below a line that contains a device name apply just
to the most recently mentioned device.
Supported options are connect-scsi, connect-device,
enable-image-buffering, and dumb-read.
Option connect-scsi specifies that the scanner is con-
nected to the system by SCSI. Input/output is performed
using SCSI-commands. This is the default. But if your
SCSI device name contains "usb", "uscanner" or "ugen",
option connect-scsi must be specified. Otherwise it is
assumed that the scanner is connected by USB.
Option connect-device specifies that the scanner is con-
nected 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 or scanners con-
nected to USB which are accessed through a named device
(e.g. /dev/usb/scanner0). For device names that contain
"usb", "uscanner" or "ugen", it is not necessary to spec-
ify option connect-device.
Option 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 lamp.
Option dumb-read can be used to work around problems with
"Error during device I/O". These problems may occur with
certain SCSI-to-USB convertors or Buslogic SCSI cards.
The option should not be used for SCSI devices which are
working correctly. Otherwise startup of frontends and
changing parameters might be slower.
A sample configuration file is shown below:
/dev/scanner
# this is a comment
/dev/hpscan
option connect-device
/dev/scanner is typically a symlink to the actual SCSI
scanner device.
FILES
/usr/freeware/etc/sane.d/hp.conf
The backend configuration file (see also descrip-
tion of SANE_CONFIG_DIR below).
/usr/freeware/lib32/sane/libsane-hp.a
The static library implementing this backend.
/usr/freeware/lib32/sane/libsane-hp.so
The shared library implementing this backend (pre-
sent on systems that support dynamic loading).
$HOME/.sane/calib-hp:<device>.dat
Calibration data for HP PhotoSmart PhotoScanner
that is retrieved from the scanner after calibra-
tion. 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'.
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 /usr/freeware/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 spec-
ified directories. For example, setting SANE_CON-
FIG_DIR to "/tmp/config:" would result in directo-
ries "tmp/config", ".", and "/usr/free-
ware/etc/sane.d" being searched (in this order).
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.
BUGS
HP PhotoSmart PhotoScanner
In media mode 'slide' and 'negative', scan resolu-
tions are rounded to multiple of 300 dpi. The scan-
ner does not scale the data correctly on other res-
olutions. Some newer models (firmware code R030 and
later) do not support adjustment of contrast/inten-
sity level and tone map. The backend will simulate
this by software, but only for gray and 24 bit
color.
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 pre-
view window is not recommended when working with
the ADF. Setting a window to scan from ADF is not
supported with xscanimage(1). Try xsane(1).
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.
TODO
HP PhotoSmart PhotoScanner
PhotoScanners with firmware release R030 and up
have no firmware support for contrast/bright-
ness/gamma table. In the current backend this is
simulated by software on 24 bits data. Simulation
on 30 bits should give better results.
Data widths greater than 8 bits
Custom gamma table does not work.
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).
SEE ALSOsane(7), sane-scsi(5), sane-usb(5)AUTHOR
The sane-hp backend was written by Geoffrey T. Dairiki. HP
PhotoSmart PhotoScanner support by Peter Kirchgessner.
sane-backends 1.0.12 06 Dec 2002 sane-hp(5)
