What is color saturation?
Color saturation refers to the intensity of color in an image. In technical terms, it is the expression of the bandwidth of light from one source. The term hue refers to the color of the image itself, while saturation describes the intensity (purity) of that hue. When the color is fully saturated, the color is considered to be the purest (true) version. The primary colors red, blue and yellow are considered full color because they are fully saturated.
As the saturation increases, the colors appear purer. As the saturation decreases, the colors appear more washed out or pale.
The color saturation determines how the hue will look in certain lighting conditions. For example, a wall painted one color will look different during the day than it does at night. Because of the light, the saturation of the wall will change during the day, although it is still the same color. When the saturation is zero you will see a shade of gray.
The brightness of the color is controlled by the amount of white in the hue.