Provided by: libsane-common_1.0.22-7ubuntu1_i386 bug


       sane-hp - SANE backend for HP ScanJet scanners


       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     and     http://penguin-

       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
       peripherals.   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
       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:


       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 for details. If the link does
       not work, try


       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
       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 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

       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
       converters  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
                option connect-device

       /dev/scanner is typically a symlink to the actual SCSI scanner device.


              The   backend   configuration  file  (see  also  description  of
              SANE_CONFIG_DIR below).

              The static library implementing this backend.

              The shared library implementing this backend (present on systems
              that support dynamic loading).

              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'.


              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).

              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
              PhotoScanner.  Must be set to the directory where the  directory
              .sane  is  located.   Is  used  to save and read the calibration



              For  each  type  of   connection   (connect-scsi,   connect-usb,
              connect-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

              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
              contrast/intensity   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  preview  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.


       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.

       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


       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)