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sane-epson(5)									    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 functions 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 backend.

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

	      Model:			   Connection Type
	      ---------------------------  -------------------
	      GT-5000			   parallel
	      GT-6000			   parallel
	      ActionScanner II		   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

       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 programs 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 Technology",  "Download  pat-
	      tern 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 slighly" 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 contrast printing".

	      The  --color-correction  switch  controls  the  scanner's internal color correction
	      function. Valid options are "No Correction", "Impact-dot printers", "Thermal print-
	      ers", "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 resulution between the lowest and  highest  possible	value.	The  list
	      reported	by the scanner can be displayed using the "--help -d epson" parameters to

	      The --mirror option controls the way the image is scanned.  By  reading  the  image
	      data from right to left the image is mirored. 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 impoved.
	      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 ta-
	      ble 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 software 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 aea. All parameters are specified in milimeters.

	      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 necessary 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 scanners 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 backend software will
	      open a given path as SCSI device. More information  about  valid	syntax	for  SCSI
	      devices can be found in sane-scsi(5).

       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  con-
	      nected via the Universal Serial Bus. The correct special device file has to be cre-
	      ated 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 com-
	      municate with the scanner. The function level a scanner supports is determined dur-
	      ing the initialization of the device. If the backend does not recognize  the  func-
	      tion  level  reported  by  the  scanner it will default to function level B5. 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!

       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 sup-
       ported 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 probably because the
       device name reported by the scanner is not in the correct format. Please send this  infor-
       mation  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

					   27-Dec-2000				    sane-epson(5)
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