Kodak I150 User Guide - Page 61

Gamma, Noise Reduction

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Gamma Noise Reduction 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. 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 A-63055 December 1999 Noise Reduction 4 x 4 55

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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