Graphics Reference
In-Depth Information
Figure 8.4.
The CIE chromaticity diagram.
0.9
0.8
0.7
G
D
0.6
0.5
J
y
0.4
R
E
0.3
0.2
B
0.1
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
x
Figure 8.5.
The RGB color cube.
The colors are called “subtractive” because they tell one what has to be subtracted
from white (rather than what has to be added to black) to get the color. The CMY
model is used with reflective sources and for devices like ink-jet plotters.
The YIQ Model.
This model is defined by the equation
Y
I
Q
0 299
.
0 587
.
0 114
.
R
G
B
Ê
ˆ
Ê
ˆ
Ê
ˆ
Á
Á
˜
˜
Á
Á
˜
˜
Á
Á
˜
˜
=
0 596
.
-
0 275
.
-
0 321
.
.
Ë
¯
Ë
¯
Ë
¯
0 212
.
-
0 523
.
0 311
.
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