Apple Final Cut Pro 7 - Manual (Page 1303)

Chroma
Chroma describes the color values in your clips, ranging from the absence of color to the
maximum levels of color that can be represented. Chroma has two properties, hue and
saturation.
Hue
Hue describes the actual color itself, whether it’s red or green or yellow. Hue is measured
as an angle on a color wheel.
0°
Magenta 29°
Blue 103°
Cyan 167°
Green –151°
Yellow –77°
Red –13°
Saturation
Saturation describes the intensity of a color, whether it’s a bright red or a pale red. An
image that is completely desaturated has no color at all and is a grayscale image. Saturation
is also measured on a color wheel, but as the distance from the center of the wheel to
the edge.
Colors toward the outer
edge of the color wheel
are more saturated.
As you look at the color wheel, notice that it is a mix of the red, green, and blue primary
colors that make up video. In between these are the yellow, cyan, and magenta secondary
colors, which are equal mixes of the primary colors. These colors are most intense at the
outer rim of the wheel and gradually desaturate to pure white at the center, indicating
the absence of color.
1303 Chapter 78 Measuring and Setting Video Levels