Olivetti d-Color MF25 User Manual page 32

Relationship between hue, brightness and saturation (color
model)
Hue, brightness and saturation are the elements that we call the "three at-
tributes of color". We can think of their affects using the solid object shown
in figure 1, where the outer edge is the hue, the vertical axis is the brightness,
and the horizontal axis from the center is the saturation.
Assigning colors to the solid object, representing the three attributes of color,
shown in figure 1 produces the color model shown in figure 2. Although the
level of saturation differs for each hue and degree of brightness, creating a
complex color model, we can get a better understanding of the conditions
under which the hue, brightness and saturation vary.
Figure 2
x-30
Color model
Figure 1
Saturation
White White
Brightness Brightness
Hue
Black Black
d-Color MF25