<P> In colorimetry and color theory , lightness , also known as value or tone , is a representation of variation in the perception of a color or color space 's brightness . It is one of the color appearance parameters of any color appearance model . </P>
<P> In colorimetry and color theory , lightness , also known as value or tone , is a representation of variation in the perception of a color or color space 's brightness . It is one of the color appearance parameters of any color appearance model . </P>
the relative lightness or darkness of a color is a property of color known as
the relative lightness or darkness of a color is a property of color known as
lightness , also known as value or tone
lightness , also known as value or tone