sane-hp(5)

NAME
sane-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. At present, 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
    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/6200C/6250C/6300C/6350C connected to the USB requires an USB driver available at http://www.jump.net/~dnelson/linux/usb (under development)

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 sane-devel@mostang.com.

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/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 /dev/hpscan A special driver is required for this card. See ftp://rvs.ctrl-c.liu.se/pub/wingel/hpscan for details.

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) on details of what constitutes a valid device name.

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.

Supported options are connect-scsi, connect-device and enable-image-buffering. 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. 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. 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.

  A sample configuration file is shown below:

    /dev/scanner
    # this is a comment
    /dev/hpscan
      option connect-device

FILES

/usr/local/etc/sane.d/hp.conf
    The backend configuration file (see also description of SANE_CONFIG_DIR below).

/usr/local/lib/libsane-hp.a
    The static library implementing this backend.

/usr/local/lib/libsane-hp.so
    The shared library implementing this backend (present 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 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'.

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/local/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 "/usr/local/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 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 scantype 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.

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/brightness/gamma table. In the current backend this is simulated by software on 24 bits data. Simulation on 30 bits should give better results.

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 ALSO
sane-scsi(5)

AUTHOR
The sane-hp backend was written by Geoffrey T. Dairiki. HP PhotoSmart PhotoScanner support by Peter Kirchgessner.