Figure 1-7.
Subtractive color process
d. Color Star.
The color star can be used to illustrate the
relationship between the additive and subtractive colors as shown in figure
1-8.
It also demonstrates the relationship between complementary colors.
Additionally, between any two points on the star representing additive
colors, you will find they combine to form the subtractive color.
Colors
opposite each other on the star are complementary.
"Complementary colors" is a term used to describe two colors that can be
combined to produce white light. Since all three of the primary colors must
be present to produce white light, it is reasonable to assume that we must
combine the additive and subtractive colors to provide the required amounts
of these
wavelengths.
Therefore, red and
cyan
(blue-green) are
complementary.
Blue and yellow (red-green) are complementary.
Green and
magenta (red-blue) are also complementary to each other. The additive will
transmit one-third of the wavelengths necessary, and the complementary will
transmit the remaining two-thirds of the wavelengths necessary to produce
white light.
Memorizing and being able to construct the color star will aid immeasurably
in understanding and solving many of the problems associated with color
photography.
1-12
SS0514
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