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In photography, red, green, and blue are
the primary colors. The secondary
colors, cyan, magenta, and yellow, are
made from combining the primary
colors: cyan = blue + green, magenta =
blue + red, and yellow = red + green. The
primary and secondary colors are
grouped in complementary pairs: red
and cyan, green and magenta, and blue
and yellow.
Knowing the complementary colors is
very important in color balancing. If the
image has a specific color cast, either subtracting the color or adding its complementary
color will create a natural looking image. For example, if the image is too red, decrease
the amount of red; if the image is too yellow, increase the amount of blue.
Adding or subtracting equal parts of red, green, and blue will have no affect on the color
balance. However, it can change the overall image brightness and contrast. Usually, no
more than two color channels are needed to color balance an image.
Color balancing is a skill that develops with practice. While the human eye is extremely
sensitive in making comparative judgements, it is a poor tool when making absolute
measurements of color. Initially, it can be very difficult to distinguish between blue and
cyan, and red and magenta. However, adjusting the wrong color channel never improves
an image; subtracting blue from an image that is too cyan will give a green cast to the
image.
35
ANINTRODUCTION TO COLOR
RED
GREENBLUE
CYAN
MAGENTA YELLOW
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