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Cha p te r
S i x

define any color within HSI color space. Hue is related to the reflected
wavelength of a color when a white light is shined on it. Intensity
(lightness) measures the degree of whiteness, or gray scale, of a given
color. Saturation is a measure of the vividness of a given hue. The
term chromaticity primarily includes elements of the hue and satura-
tion components. Researchers depict color in space using hue as the
angle of a vector, saturation as the length of it, and intensity as a plus
or minus height from a center point (Fig. 6.9).
The concepts of hue, saturation, and intensity can be further clari-
fied by a simplified pictorial presentation. Consider Fig. 6.10, where a
color is depicted at a molecular level. Color is created when light inter-
acts with pigment molecules. Color is generated by the way pigment

FIGURE 6.9 Coordinates of hue, saturation, and intensity of color in space.

FIGURE 6.10 Model of color interpretation.