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EPSON AMERICA, INC.
Product Support Bulletin
Subject: Image Editing Terms
Date: 6/5/91
Page(s): 1 of 3
The following terms' are used to describe image editing and grayscale in
connection with scanners, monitors and printers.
Additive
Primary Colors:
Aliasing:
Antialiasing :
Brightness:
Continuous
Tone:
Contrast:
Cropping:
Dithering:
DPI:
'Some terms taken from PC Publishing, Jan. 1990.
The colors produced by mixing colored light. The primary
additive colors are red, green and blue. The absence of color
produces black (0%); maximum intensity produces white (100%).
This principle is used in color monitors (RGB). By using 24 bits
per pixel it is possible to represent more than 16 million colors.
The jagged diagonal lines that appear in low resolution mode.
Usually noticeable on characters like 'A" and VV'!
The removal of the aliasing or step-like diagonal lines.
The balance of light and dark shades.
The transition from light to dark or dark to light in a smooth
uninterrupted progression. Laser and dot matrix printers do not
support continuous tones.
The range between the darkest and lightest shades of an image.
As contrast increases, the number of gray shades between black
and white decreases.
An operation that allows portions of an image to be selected.
Usually pertains to scanning technology.
A method of shading that uses black dots of varying density to
represent darker areas. This technology is used in devices that
only support black and white outputs.
Abbreviation for dot per inch. The standard measurement of
resolution for all output devices. DPI describes the number of
pixels in an image.
PSB No: P-0078
Originator: RS
EPSON