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

       sane-epson - SANE backend for EPSON scanners

       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-

       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.

       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
	      image 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)",
	      "Halftone	 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 Technol-
	      ogy", "Download pattern A", and "Download pattern B".

	      The --dropout switch selects the so called dropout  color.  Vald
	      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-

	      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
	      determine	 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
	      defined 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
	      selects the width and -y the height of the scan area. All param-
	      eters 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
	      depend 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.

       The configuration file /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-
	      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.

	      The static library implementing this backend.

	      The shared library implementing this backend (present on systems
	      that support dynamic loading).

	      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.

	      This allows 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

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

       None :-) At least none are currently known.

       The  backend  may  be  used with Epson scanners that are not yet listed
       under the list of supported devices. A scanner that is  not  recognized
       may  default  to	 the function level B3, which means that not all func-
       tions 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
       AUTHORS file of the SANE distribution).

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

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

sane-backends 1.0.18		  27-Dec-2000			 sane-epson(5)