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

NAME
       sane-epson - SANE backend for EPSON scanners

DESCRIPTION
       The  sane-epson	library	 implements  a	SANE (Scanner Access Now Easy)
       backend that provides access to Epson flatbed scanners.	Some functions
       of  this	backend	should be considered beta-quality software! Most func-
       tions have been stable for a long time, but of course  new  development
       can  not	and often times	will not function properly from	the very first
       day. Please report any strange behavior to the maintainer of the	 back-
       end.

       At present, the following scanners are known to work with this backend:

	      Model:			   Connection Type
	      ---------------------------  -------------------
	      GT-5000			   SCSI, parallel
	      GT-6000			   parallel
	      GT-6500			   SCSI	(use only the line "scsi" in epson.conf)
	      ActionScanner II		   SCSI, parallel
	      GT-7000			   SCSI
	      Perfection 636		   SCSI
	      Perfection 636U		   USB
	      Perfection 610		   USB
	      Perfection 640		   USB
	      Perfection 1200S		   SCSI
	      Perfection 1200U		   USB
	      Perfection 1240		   USB,	SCSI
	      Perfection 1640		   USB,	SCSI
	      Perfection 1650		   USB
	      Perfection 1660		   USB
	      Perfection 2400		   USB
	      Perfection 2450		   USB,	IEEE-1394
	      Expression 636 / GT-9500	   SCSI
	      Expression 1600		   USB,	SCSI, IEEE-1394
	      Expression 1680		   USB,	SCSI, IEEE-1394
	      CX-3200			   USB
	      CX-5200			   USB
	      and many more. The official list is on the Sane web site.

       For other scanners the software	may or may not work.  Please send mail
       to the backend author (khk@khk.net) to report success with scanners not
       on the list or problems with scanners that are listed.

OPTIONS
       The options the backend supports	can either be selected through command
       line options to programs	like scanimage or through GUI elements in pro-
       grams like xscanimage or	xsane.

       Valid command line options and their syntax can be listed by using
	      scanimage	--help -d epson
       Not all devices support all options.

       Scan Mode
	      The  --mode  switch  selects  the	basic mode of operation	of the
	      scanner. Valid choices are Binary, Gray and Color.   The	Binary
	      mode  is	black  and white only, Gray will produce 256 levels of
	      gray or more depending on	the scanner and	 Color	means  24  bit
	      color mode or more depending on the scanner.  Some scanners will
	      internally use 36	bit color, their  external  interface  however
	      may only support 24 bits.

	      The  --depth  option selects the bit depth the scanner is	using.
	      This option is only available for	 scanners  that	 support  more
	      than  one	bit depth. Older scanners will always transfer the im-
	      age in 8bit mode.	Newer scanners allow to	select either 8	 bits,
	      12  or 14	bits per color channel.	For a color scan this means an
	      effective	color depth of 36 or 42	bits over all three  channels.
	      The valid	choices	depend on the scanner model.

	      The  --halftoning	switch selects the mode	that is	used in	Binary
	      mode. Valid options are "None", "Halftone	A (Hard	Tone)",	"Half-
	      tone  B  (Soft Tone)", "Halftone C (Net Screen)",	"Dither	A (4x4
	      Bayer)", "Dither B (4x4 Spiral)",	"Dither	C (4x4	Net  Screen)",
	      "Dither  D (8x4 Net Screen)", "Text Enhanced Technology",	"Down-
	      load pattern A", and "Download pattern B".

	      The --dropout switch selects the so called dropout color.	 Valid
	      options  are None, Red, Green and	Blue. The default is None. The
	      dropout color is used for	monochrome scanning  and  selects  the
	      color  that  is  not  scanned.  This can be used to e.g. scan an
	      original with a colored background.

	      The --brightness switch controls the  brightness	of  the	 scan.
	      Valid options are	integer	values from -3 to 3. The default is 0.
	      The larger the brightness	value, the brighter the	image gets. If
	      a	 user  defined table for the gamma correction is selected, the
	      brightness parameter is not available.

	      The --sharpness switch sets the sharpness	 of  the  image	 data.
	      Valid  options  are integer values from -2 to 2, with -2 meaning
	      "Defocus",  -1  "Defocus	slightly",  0  "Normal",  1   "Sharpen
	      slightly"	and 2 "Sharpen".

	      The  --gamma-correction  switch  controls	the scanner's internal
	      gamma correction.	Valid options are "Default",  "User  defined",
	      "High  density  printing"	 "Low density printing"	and "High con-
	      trast printing".

	      The --color-correction switch controls  the  scanner's  internal
	      color  correction	 function.  Valid options are "No Correction",
	      "Impact-dot printers", "Thermal  printers",  "Ink-jet  printers"
	      and "CRT monitors". The default is "CRT monitors".

	      The  --resolution	switch selects the resolution for a scan. Some
	      EPSON scanners will scan in any resolution  between  the	lowest
	      and highest possible value. The list reported by the scanner can
	      be displayed using the "--help -d	epson" parameters  to  scanim-
	      age.

	      The  --mirror  option  controls the way the image	is scanned. By
	      reading the image	data from right	to left	the image is mirrored.
	      Valid options are	"yes" and "no".	The default is "no".

	      The  --speed  option  can	 improve  the scan speed in monochrome
	      mode. Valid options are "yes" or "no",  the  "yes"  option  will
	      speed up the scan	if this	option is supported.

	      The --auto-area-segmentation switch activates the	automatic area
	      segmentation for monochrome scans. The scanner will try  to  de-
	      termine which areas are text and which contain images. The image
	      areas will be halftoned, and the text will  be  improved.	 Valid
	      options are "yes"	and "no". The default is "yes".

	      The  --gamma-table  parameter can	be used	to download a user de-
	      fined gamma table. The option takes 256 values  from  the	 range
	      0-255. In	color mode this	option equally affects the red,	green,
	      and blue channel.

	      The --red-gamma-table parameter can be used to download  a  user
	      defined  gamma  table for	the red	channel. The valid options are
	      the same as for --gamma-table.

	      The --green-gamma-table parameter	can be used to download	a user
	      defined gamma table for the green	channel. The valid options are
	      the same as for --gamma-table.

	      The --blue-gamma-table parameter can be used to download a  user
	      defined  gamma table for the blue	channel. The valid options are
	      the same as for --gamma-table.

	      The color	correction coefficients	--cct-1	 --cct-2  --cct-3  ...
	      --cct-9  will install color correction coefficients for the user
	      defined color correction.	Values are specified  as  integers  in
	      the range	-127..127.

	      The --preview option requests a preview scan. The	frontend soft-
	      ware automatically selects a low resolution. Valid  options  are
	      "yes" and	"no". The default is "no".

	      The --preview-speed options will increase	the scan speed if this
	      is supported by the scanner. Valid options are "yes"  and	 "no",
	      the default is "no".

	      The  geometry options -l -t -x -y	control	the scan area: -l sets
	      the top left x coordinate, -t the	top left y coordinate, -x  se-
	      lects  the width and -y the height of the	scan area. All parame-
	      ters are specified in millimeters.

	      The --quick-format option	lets the user select a scan area  with
	      predefined  sizes. Valid parameters are "CD", "A5	portrait", "A5
	      landscape", "Letter", "A4" and  "max".  The  default  is	"max",
	      which selects the	largest	possible area.

	      The  --source  option selects the	scan source. Valid options de-
	      pend on the installed options. The default is "Flatbed".

	      The --auto-eject option will eject a page	 after	scanning  from
	      the document feeder.

	      The  --film-type option will select the film type	for scans with
	      the transparency unit. This option is only activated if the  TPU
	      is  selected  as	scan source. Valid options are "Negative Film"
	      and "Positive Film".

	      The --focus-position option selects the focus position  for  all
	      scans. Valid options are "Focus 2.5mm above glass" and "Focus on
	      glass". The focus	on the 2.5mm point above the glass  is	neces-
	      sary  for	 scans with the	transparency unit, so that the scanner
	      can focus	on the film if one of the film holders is used.	  This
	      option is	only functional	for selected scanners, all other scan-
	      ners will	ignore this option.

CONFIGURATION FILE
       The configuration file /usr/local/etc/sane.d/epson.conf	specifies  the
       device(s) that the backend will use. Possible connection	types are:

       SCSI   This  is the default, and	if nothing else	is specified the back-
	      end software will	open a given path as SCSI device. More	infor-
	      mation  about  valid  syntax  for	 SCSI  devices can be found in
	      sane-scsi(5).
	      Usually SCSI scanners are	configured with	a line "scsi EPSON" in
	      this  file.  In  some  cases it may be necessary to only use the
	      string "scsi" (e.g. for the GT-6500).

       PIO - Parallel Interface
	      The parallel interface can be configured in two ways: An integer
	      value starting at	the beginning of a line	will be	interpreted as
	      the IO address of	the parallel port. To make it clearer  that  a
	      configured IO address is a parallel port the port	address	can be
	      preceded by the string "PIO". The	PIO connection does not	use  a
	      special device file in the /dev directory. The IO	address	can be
	      specified	in hex mode (prefixed with "0x").

       USB    A	device file that is preceded by	the string "USB" is treated as
	      a	 scanner  connected  via the Universal Serial Bus. The correct
	      special device file has to be created prior  to  using  it  with
	      Sane.  See  the USB documentation	for more information about how
	      to set up	the USB	subsystem and the required device files.

FILES
       /usr/local/lib/sane/libsane-epson.a
	      The static library implementing this backend.

       /usr/local/lib/sane/libsane-epson.so
	      The shared library implementing this backend (present on systems
	      that support dynamic loading).

ENVIRONMENT
       SANE_DEBUG_EPSON
	      If the library was compiled with debug support enabled, this en-
	      vironment	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.

       SANE_DEBUG_EPSON_SCSI
	      If the library was compiled with debug support enabled, this en-
	      vironment	 variable  controls  the  SCSI related debug level for
	      this backend.  Only a value of 2 is supported.

       SANE_EPSON_CMD_LVL
	      This allows one to override the function or command  level  that
	      the  backend  uses to communicate	with the scanner. The function
	      level a scanner supports is determined during the	initialization
	      of  the  device.	If the backend does not	recognize the function
	      level reported by	the scanner it will default to function	 level
	      B3.  Valid  function  levels are A1, A2, B1, B2, B3, B4, B5, B6,
	      B7, B8, D1 and F5. Use this feature only if you  know  what  you
	      are doing!

SEE ALSO
       sane-scsi(5), scanimage(1), xscanimage(1), xsane(1)

BUGS
       None :-)	At least none are currently known.

UNSUPPORTED DEVICES
       The backend may be used with Epson scanners that	are not	yet listed un-
       der the list of supported devices. A scanner that is not	recognized may
       default	to  the	 function level	B3, which means	that not all functions
       that the	scanner	may be capable of are accessible.

       If the scanner is not even recognized as	an Epson scanner this is prob-
       ably because the	device name reported by	the scanner is not in the cor-
       rect format. Please send	this information  to  the  backend  maintainer
       (email  address is in the AUTHOR	section	of this	man page or in the AU-
       THORS file of the SANE distribution).

       The Perfection 600, Perfection 650, Perfection 660, Perfection 1250 and
       Perfection 1260 are not supported by this backend.

AUTHOR
       The  package is actively	maintained by Karl Heinz Kremer	(khk@khk.net).
       The software is based on	work by	Christian Bucher and Kazuhiro Sasayama

				  11 Jul 2008			 sane-epson(5)

NAME | DESCRIPTION | OPTIONS | CONFIGURATION FILE | FILES | ENVIRONMENT | SEE ALSO | BUGS | UNSUPPORTED DEVICES | AUTHOR

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