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.TH SANE\-EPKOWA 5 "2012-03-05" "Image Scan! for Linux"
.IX sane\-epkowa
.SH NAME
sane\-epkowa - SANE backend for EPSON scanners
.SH DESCRIPTION
The
.B 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
.I iscan-data
package's documentation directory, typically
.I /usr/share/doc/iscan-data/.
.SH 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
.RS
scanimage \-\-help \-d epkowa
.RE
Not all devices support all options and not all options may be docmented below.
.TP
.I Scan Mode
The
.I \-\-mode
switch selects the basic mode of operation of the scanner valid choices are
.I 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
.I \-\-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
.I \-\-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
.I \-\-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
.I \-\-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
.I \-\-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
.I \-\-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
.I \-\-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 scanimage.
The
.I \-\-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
.I \-\-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
.I \-\-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
.I \-\-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
.I \-\-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
.I \-\-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
.I \-\-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
.I \-\-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
.I \-\-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
.I \-\-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
.I \-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
.I \-\-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
.I \-\-source
option selects the scan source. Valid options depend on the installed options. The default
is "Flatbed".
The
.I \-\-auto\-eject
option will eject a page after scanning from the document feeder.
.SH CONFIGURATION FILE
The configuration file @CONFIGDIR@/epkowa.conf specifies the device(s) that the
backend will use. Possible connection types are:
.TP
.I USB
All supported USB devices should be recognised automatically when the
"usb" keyword is specified. You may have to add yourself 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.
.TP
.I 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.
.TP
More extensive documentation is available in the comments of the
default configuration file.
.SH FILES
.TP
.I @LIBDIR@/libsane\-epkowa.a
The static library implementing this backend.
.TP
.I @LIBDIR@/libsane\-epkowa.so
The shared library implementing this backend (present on systems that
support dynamic loading).
.SH ENVIRONMENT
.TP
.B SANE_DEBUG_EPKOWA
If the library was compiled with debug support enabled, this
environment variable controls the debug level for this backend. The
following, case insensitive string literals are supported (in
increasing level of feedback): FATAL, MAJOR, MINOR, INFO, CALL, DATA,
CMD, HEX, IMG. Note that the last level includes the raw image data
as obtained from the scanner and produces vast amounts of output. For
most trouble shooting situations, the HEX level is sufficient.
.TP
.B 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 include
A1, A2, B1, B2, B3, B4, B5, B6, B7, B8, D1, D2, D7, D8 and F5. Use
this feature only if you know what you are doing!
.SH "SEE ALSO"
sane\-scsi(5), scanimage(1), xscanimage(1), xsane(1)
.SH BUGS
Sometimes the scanner is not initialized correctly. The problem can be
resolved by killing the program and restarting it again.
.SH UNSUPPORTED DEVICES
Note that a number of EPSON scanners require a non-free plugin before
they can be used by the backend.
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 it is
probably because the device info reported by the scanner is not in
the correct format. Please send this information to the sane-devel
mailing list.
.SH AUTHOR
AVASYS CORPORATION
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