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Glossary
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Index
Appendix
Introduction
Glossary
Contents
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Documents
How to Use
ScandAll PRO
Scan Pa-
rameters
Various
Documents
Daily Care
Trouble-
shooting
Operational
Settings
Consumables
Scanner
Overview
G
Gamma
A unit of changes of images' brightness. It is expressed as a function of the electric input power to devices (scanner, display,
etc.) and an image's brightness. If the gamma rate is larger than 1, the brightness of an image increases and vice versa. In
order to adjust the brightness of an image close to the original, generally the gamma value is set to 1.
Gray scale
A method for realizing the gradation from black to white on the scanned image. For example, when scanning monochrome
documents, the computer recognizes the documents as sets of black and white dots. In the Gray scale method, each dot
contains data regarding density of black. The original gradation of the documents is realized as the gradation of the density
data.B
H
Halftone processing
Any method used to reproduce a photograph which includes a shade as an image composed of dots, namely, a binary image.
Dithering and error diffusion processing are examples of halftone processing.
I
Image emphasis
Density is decreased for lighter but not completely white areas adjacent to black areas. Weakening this emphasis eliminates
spot noise or produces softened images.
Image processing
An image is scanned with specified parameters.
Interface
The connection that allows communication from the computer to the scanner.
Inversion (Reverse-image reading)
In reverse-image reading, data is changed from black to white and vice versa.
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