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sane-hp(5)			   SANE Scanner Access Now Easy 		       sane-hp(5)

       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 http://www.torque.net/parport/ppscsi.html (under development)

       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
       http://www.mostang.com/sane.   You  can	also  watch   the   sane-devel	 mailinglist   at

       More  details  about  the  hp  backend  can be found on its homepage http://www.kirchgess-

       This backend expects device names of the form:


       Where special is the UNIX path-name for the special device that corresponds to  the  scan-
       ner.  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

       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 device.

       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 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:

	      # 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.

       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)
	      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 imme-
	      diate 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 con-
	      trast/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  inter-
	      nal 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.

@PACKAGEVERSION@			   06 Dec 2002				       sane-hp(5)
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