sane-rts8891

sane-rts8891(5) SANE Scanner Access Now Easy sane-rts8891(5)

NAME

   sane-rts8891 - SANE backend for rts8891 based scanners

DESCRIPTION

   The sane-rts8891 library implements a SANE (Scanner Access Now Easy) backend that provides access to scanners based on the rts8891 ASIC.

   The scanners that work with this backend are:

             Vendor Model           status
          ----------------------  -----------
            Umax Astra 4400       untested
            Umax Astra 4450       untested
            HP scanjet 4000c      good
            HP scanjet 4470c      good

   The options the backend supports can either be selected through command line options to programs like scanimage(1) or through GUI elements in xscanimage(1) or xsane(1).

   If you notice any strange behavior, please report to the backend maintainer or to the SANE mailing list.

   Valid command line options and their syntax can be listed by using

          scanimage --help -d rts8891

   Scan Mode Options

   --mode selects  the  basic  mode  of  operation of the scanner. Valid choices are Color, Gray and Lineart.  The default mode is Color.  The Lineart mode is for black and white only (1
          bit).  Gray will produce 256 levels of gray (8 bits).  Color mode allows for over 16 million different colors produced from 24 bits of color information.

   --resolution
          selects the resolution for a scan. The horizontal and vertical resolutions are set by the value of this option. The scanner is capable of  the  following  resolutions  for  the
          specified option value:

            Value   Hor. Resolution  Vert. Resolution
            -----   ---------------  -------------------
            75      75dpi            75dpi
            150     150dpi           150dpi
            300     300dpi           300dpi
            600     600dpi           600dpi
            1200    1200dpi          1200dpi

   --preview
          requests  a  preview  scan. The resolution used for that scan is 75 dpi and the scan area and the scan mode are as specified through their options, or the default if not speci
          fied. The default value for preview mode is "no".

   --threshold
          selects the  minimum-brightness to get a white point. The threshold is only used with Lineart mode scans.  It is specified as a percentage in the range 0..100% (in steps of 1).
          The default value of the threshold option is 50.

CONFIGURATION FILE

   The configuration file /etc/sane.d/rts8891.conf contains the usb device ids of supported scanners (eg usb 0x043d 0x007c) and scanner configuration  options.   Empty  lines  and  lines
   starting with a hash mark (#) are ignored.

   The options supported are allowsharing, modelnumber

   Option

   allowsharing
          enables or not the sharing of the scanner between multiple frontends at the same time.

   modelnumber
          is used to force the reported model by the backend and is only useful in the case of a scanner which NVRAM has been erased.

          0 to report a HP4470c.
          1 to report a HP4400c.
          2 to report an Astra 4400.

FILES

   /usr/lib/x86_64-linux-gnu/sane/libsane-rts8891.a
          The static library implementing this backend.

   /usr/lib/x86_64-linux-gnu/sane/libsane-rts8891.so
          The shared library implementing this backend (present on systems that support dynamic loading).

ENVIRONMENT

   SANE_DEBUG_RTS8891 SANE_DEBUG_RTS8891_LOW SANE_DEBUG_RTS88XX_LIB
          If  the library was compiled with debug support enabled, these environment variables control the debug level for this backend. E.g., a value of 255 requests all debug output to
          be printed. Smaller levels reduce verbosity.

LIMITATIONS

   Scanners of the same model exist with different sensors, due to lack of data (ie USB logs) some sensors are better supported than others. At least 75  dpi  mode  is  working  for  any
   model. Sharing the scanner between several frontends at the same time (allowsharing option) may not work on some USB controllers.

   XPA is not (yet) supported.

BUGS

   No bugs currently known.

SEE ALSO

   sane-scsi(5), scanimage(1), xscanimage(1), xsane(1), sane(7)

AUTHOR

   This backend has been developed by Stéphane Voltz.
          http://stef.dev.free.fr/sane/rts8891

CREDITS

   Many thanks go to:
          Laurent Fournier who donated me a HP4470c.  Vladimir Sysoev and "TheUnruly Squash" for the time they spent recording USB activity and testing the experimental version on HP4400
          models.

                                                                                      8 Dec 2008                                                                           sane-rts8891(5)