sane-epkowa(5)sane-epkowa(5)NAMEsane-epkowa - SANE backend for EPSON scanners
DESCRIPTION
The sane-epkowa library implements a SANE (Scanner Access Now Easy)
backend that provides access to a large number of EPSON devices. A
list with supported device information may be found in the iscan pack‐
age's documentation directory, typically /usr/share/doc/iscan/.
OPTIONS
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 epkowa
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 up to 256 levels
of gray and Color means 24 bit color mode. Some scanners will
internally use 36 bit color, the external interface however does
only support 24 bits.
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. 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 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 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. Many
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 epkowa" 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 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 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.
CONFIGURATION FILE
The configuration file /etc/sane.d/epkowa.conf specifies the device(s)
that the backend will use. The current version only supports one scan‐
ner per EPSON backend. Possible connection types are:
USB All supported USB devices should be recognised automatically
when the "usb" keyword is specified. You may have to add your‐
self to a specific system group though to get the privileges
required to access the device. See the configuration file for
information on how to get unsupported devices recognised.
SCSI The "scsi" keyword activates detection of supported SCSI
devices. If your device is not recognised despite this see the
configuration file for more information.
FILES
/usr/lib64/sane/libsane-epkowa.a
The static library implementing this backend.
/usr/lib64/sane/libsane-epkowa.so
The shared library implementing this backend (present on systems
that support dynamic loading).
ENVIRONMENT
SANE_DEBUG_EPKOWA
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
and F5. Use this feature only if you know what you are doing!
SEE ALSOsane-scsi(5), scanimage(1), xscanimage(1), xsane(1), sane-epson(5)BUGS
When used with "scanimage -T" the backend hangs after successfully com‐
pleting the tests. It is necessary to powercycle the scanner to get the
communication between backend and scanner going again.
Sometimes the scanner is not initialized correctly. The problem can be
resolved by killing the program and restarting it again.
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 it is proba‐
bly 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 AUTHORS file).
AUTHOR
AVASYS CORPORATION
2008-11-10 sane-epkowa(5)
