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 Interface 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://cyberelk.net/tim/par-
port/ppscsi.html and http://penguin-breeder.org/kernel/download/.
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-function peripher-
als. For these devices use the external "hpoj" backend in version 0.90
and later of the "HP OfficeJet Linux driver", available at
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.sane-project.org/.
You can also watch the sane-devel mailing list at
More details about the hp backend can be found on its homepage
This backend expects device names of the form:
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 specified below a line that
contains a device name apply just to the most recently mentioned
Supported options are connect-scsi, connect-device,
enable-image-buffering, and dumb-read.
Option connect-scsi specifies that the scanner is connected to the sys-
tem 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 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 or scanners connected 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 specify option con-
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 convert-
ers 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:
# this is a comment
/dev/scanner is typically a symlink to the actual SCSI scanner device.
The backend configuration file (see also description of
The static library implementing this backend.
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 config-
uration 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 sepa-
rator 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
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.
Only used for OS/2 and along with use of HP PhotoSmart Photo-
Scanner. Must be set to the directory where the directory .sane
is located. Is used to save and read the calibration file.
For each type of connection (connect-scsi, connect-usb, con-
nect-device) it can be specified if the connection to the device
should be kept open ("1") or not ("0"). Usually the connections
are closed after an operation is performed. Keeping connection
open to SCSI-devices can result in errors during device IO when
the scanner has not been used for some time. By default, USB-
connections are kept open. Other connections are closed.
Specifies number of retries for read operation before returning
an EOF error. Only supported for non-SCSI devices. Default: 1
retry. Time between retries is 0.1 seconds.
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 con-
trast/intensity level and tone map. The backend will simulate
this by software, but only for gray and 24 bit color.
Automatic Document Feeder (ADF)
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. Simula-
tion 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 inter-
face card, currently only the HP ScanJet 5100C/5200C are sup-
ported. These scanners are using an internal parallel-to-SCSI
converter which is supported by the ppSCSI-driver (see above).
sane(7), sane-scsi(5), sane-usb(5)
The sane-hp backend was written by Geoffrey T. Dairiki. HP PhotoSmart
PhotoScanner support by Peter Kirchgessner.
13 Jul 2008 sane-hp(5)
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