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 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 2450 USB
Expression 636 / GT-9500 SCSI
Expression 1600 USB, SCSI, IEEE-1394
For other scanners the software may or may not work. Please send mail
to the backend author ([email protected]) to report successes or failures.
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.
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, the external interface however does
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
or 12 or 14 bits per color channel. For a color scan this means
an effective color depth of 36 or 42 bits over all channels. The
valid choice depend on the scanner model.
The --dropout option determines which color filters are used to
scan in Binary mode. Valid choices are None, Red, Green and
Blue.
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 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 the numbers 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 the numbers 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 scanne 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 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. Many
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 scanimage.
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 turns on 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 options 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. Possible values are 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 of 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.
The configuration file /etc/sane.d/epson.conf specifies the device(s)
that the backend will use. The current version only supports one scanner
per Epson backend. Possible connection types are:
SCSI This is the default, and if nothing else is specified the backend
software will open a given patch as SCSI device. More information
about valid syntax for SCSI devices can be found in sanescsi(5).
PIP - Parallel Interface
The parallel interface can be configured in two ways: An integer
number 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.
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.
/usr/lib/sane/libsane-epson.a
The static library implementing this backend.
/usr/lib/sane/libsane-epson.so
The shared library implementing this backend (present on systems
that support dynamic loading).
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 [Toc] [Back]
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
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 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 probably
because the device name reported by the scanner is not in the correct
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 package is actively maintained by Karl Heinz Kremer ([email protected]).
The software is based on work by Christian Bucher and Kazuhiro Sasayama
27-Dec-2000 sane-epson(5)
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