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This is the HP 3770 SANE driver for Linux

Installation:
    Installation is manual.
    Unpack the hp3770 SANE driver (as root) to /usr/lib/sane:
# cd /
# tar -xvzf /…./hp3770.tgz
Note: /README file left in root directory
    Unpack the modified SANE library to /usr/lib/sane:
# cd /
# tar -xvzf /…./libsane.tgz

libsane.so Modification
    IF YOU UNPACKED THE MODIFIED SANE LIBRARY ABOVE, YOU CAN SKIP THIS STEP

    libsane-hp3770.so is a SANE driver that contains only HP-authored code.
    The HP driver contains calls to libsane.so.  Unfortunately, libsane.so
    lacks the sanei_usb module.  To add this module,
1) Obtain the SANE distribution from http://www.sane-project.org.
2) add „sanei_usb.lo” to the „EXTRA” line in backend/Makefile.in:

diff -e backend/Makefile.in ../sane-backends-1.0.13.hp/backend/Makefile.in
71c
EXTRA = sane_strstatus.lo ../sanei/sanei_init_debug.lo ../sanei/sanei_config.lo ../sanei/sanei_usb.lo
.

3) follow the SANE README build and instructions.  This sequence of
  instructions appears to install in /etc/sane.d and /usr/lib:
cd sane-backends-1.0.13
configure –prefix=/usr –sysconfdir=/etc
        make
        su
        make install

SANE DLL configuration:
    The hp3770 SANE backend will be loaded by the SANE dll by adding „hp3770”
    to /etc/sane.d/dll.conf.  SANE initializaion is much faster if unneeded
    backend modules in dll.conf are commented out.

    See Also:  man 5 sane-dll

USB Configuration
    The hp3770 SANE backend uses libusb (Linux kernel 2.4.19 and later).
    After USB finds the scanner, it should appear somewhere under
    /proc/bus/usb.  Be sure you have read/write permissions set correctly.
    „sane-find-scanner” should find the hp3770 once it is properly connected.

    The scanner’s device name depends on how USB assigns it.  If, for
    example, the scanner appears as /proc/bus/usb/001/005, then specify
    „hp3770:libusb:001:005” as the SANE device name.

    See Also:  man 5 sane-usb

Features:
    Scan modes: color, monochrome (greyscale), and lineart (black & white).
    Scan depths (bits per color channel): 1, 8, 16
    Scan resolutions (dpi) in x direction: 200, 300, 600, 1200
    Scan resolutions (dpi) in y direction: 200, 300, 600, 1200, 2400
    Scan area specified in top-left and bottom-right coordinates.

    These features are exposed through well known SANE options:
optCount Return option count
optTLX, optTLY, optBRX, optBRY scan area
resolution, x_resolution, y_resolution scan dpi
optMode color, monochrome, lineart
optDepth bits per color channel

    See Also:
SANE API Specification – http://www.sane-project.org/html/doc000.html

Limitations:
    This driver is beta software.  Bug reports, comments, and suggestions
    are welcome.

    Scanning of slides or negatives is not implemented.

    Buttons are not supported.

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