sane-rts8891 man page on Debian

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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 or through GUI elements in
       xscanimage or xsane.

       If you have any strange behavior, please report to  the	backend	 main‐
       tainer 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 R Color , Gray and Lineart The default mode  is  Color.  The
	      Lineart  mode  is	 black and white only (1 bit).	Grayscale 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 specified. 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 configura‐
       tion  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 usefull 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/sane/libsane-rts8891.a
	      The static library implementing this backend.

       /usr/lib/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 controls 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  a  scanner
       between	several	 frontends  at the same time (allowsharing option) may
       not work on some USB controllers.

       XPA is no (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 developped 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 activ‐
	      ity and testing the experimental version on HP4400 models.

				  8 Dec 2008		       sane-rts8891(5)
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