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# sane-epson.5

    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                      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
                  CX-3200                      USB
                  CX-5200                      USB

           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
                  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
                  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  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 resulution 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 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 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 aea. All parame-
                  ters 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 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).

           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
                  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.

           SANE_EPSON_CMD_LVL
                  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 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!

## 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
           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.

## 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

    sane-backends 1.0.12-cvs          27-Dec-2000                    sane-epson(5)