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A-63055 December 1999 18
Gamma
The Gamma option allows you to define the gamma curve setting for
normal scanning and computer screen viewing. Choose one of the five
gamma curves in the
Gamma
drop-down list box. There are standard
and CRT levels in a gamma curve. If you intend to view the scanned
images on a computer screen, select “CRT.”
When “User Download” is selected, you must specify a gamma pattern
(*.PXG file). Click on the
Gamma
button in the Download From File
group box and select a gamma pattern in the file selection box.
A gamma setting can be specified only when a Dither pattern, an Error
Diffusion pattern for Binary mode, or a Grayscale mode is selected.
Lamp
Select “Red” in the Lamp box to allow the scanner to perform red
dropout color. The green lamp is the normal setting. When red dropout
is specified, most red characters, lines, or illustrations will not be
captured when a document is scanned.
NOTE: This feature is available only on the Scanner 2500.
Length Control
When Length Control is selected, the scanned image length is
automatically determined. Different length documents will be detected
and scanned accordingly, thereby conserving memory.
By using
Length Control
, the scanner does not use excessive memory.
For example, if you are simultaneously scanning A4 and A5 size
documents, and the A5 size is in a horizontal position and
Length
Control
is off, the A5 horizontal document will be scanned as A4 size.
The bottom half of the paper will become a black image. If
Length
Control
is on, the A5 horizontal document is scanned as horizontal A5.
A5
Landscape
A5
Landscape
A5
Landscape
Document Length Control off Length Control on