Table of Contents
Advertisement
Primary colors
The primary colors are two types; the primaries of light and the primaries of material.
Additive Process
The primaries of light refer to red (R), green (G), and blue (B). When these three colors are
mixed, the result is transparent (white light); the Additive Process.
On the other hand, the primaries of material (such as paint, ink, or toner) are cyan (C),
magenta (M), and yellow (Y). When these three colors are mixed, the result is black; the
Subtractive Process.
When any two adjacent colors of the primaries of light are mixed, the result is one color of the
primaries of material. For example, when red (R) and green (G) of the primaries of light are
mixed, the result is yellow (Y) of the primaries of material.
6-3
Reduced Gradation
A function which reduces the number of color gradations of an image.
8-24,
1-34
Reproduction of color
In general, a color copy machine or color printing reproduces full color by four colors consist-
ing of the primaries (cyan, magenta, yellow) and black. Black can be principally generated by
mixing all three primary colors. However, the mixing result tends to have a component of
brown, not a real black. Thus, black is added as one of the full color components. Also,
another reason is that use of only black toner for a black portion is economical.
Sharpness
A function which enhances the edges of an image to make a clear discrimination from the
background.
6-25
1-20
Shift
A function which changes the image position on the copies to the top, bottom, left, right,
corner, center, or a user-designated location.
4-2,
1-5
Subtractive Process
References
P-S
3
3-7
7
Advertisement
Table of Contents
