Figure 2-2. Additive primary colors
(You are looking at the colors being projected on a
screen by three different projectors, each casting a
single primary color.)
a. Now an interesting thing happens when you shut off one of the
projectors, leaving only two primary colors shining on the wall.
If you
turn off the red projector, the resulting color will be a combination of
green and blue called cyan, which looks like what is often called aquamarine
or turquoise.
b. If you turn off the green projector, the resulting color is a
combination of red and blue called magenta, a reddish purple shade.
c. Most surprising of all, if you turn off the blue projector, the
resulting combination of red and green is yellow.
d. These three colors are called subtractive primary colors, also often
called complementary colors (fig 2-3).
e. The relationship of additive and subtractive primary colors is shown
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