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 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 contrast 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 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 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 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.