Saturation is the amount of gray in the color, from 0 to 100 percent. Reducing the saturation toward zero to introduce more gray produces a faded effect. Sometimes, saturation is expressed in a range from just 0.0 – 1.0, where 0.0 is gray and 1.0 is a primary color.
La saturation est la quantité de gris dans la couleur (de 0 à 100%). Plus la saturation est faible, plus la couleur est grisée.