Filter
Top Products
A-63055 December 1999 55
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 “For CRT.” Otherwise, choose
“Normal.”
A gamma setting can be specified only when a Halftone (Dither)
pattern, an Error Diffusion pattern for Binary mode, or a Grayscale
mode is selected.
Noise Reduction
Unwanted black speckles or splotches in a scanned document are
referred to as noise. Noise Reduction improves image clarity by
removing black spots, dust, or voids in white areas. Choose a noise
reduction level in the
Noise Reduction
box. The default is “None.”
The more noise in a scanned image, the larger the compressed file
size. Also, if images are being produced for an OCR system (a system
that can read text from an image produced by a scanner), too much
noise may lessen the reliability and read rate of the OCR system.
While choosing the larger matrix decreases large noise, commas (,) or
decimal points (.) may disappear as well.
Noise Reduction
is valid only
in Binary mode. Using
Noise Reduction
is not recommended when
using a
Halftone
(Dither) setting.
None Noise Reduction 4 x 4