The dimension of the color of an object by which the object appears to reflect or transmit more or less of the incident light, varying from black to white for surface colors and from black to colorless for transparent volume colors.

• (颜色的)浅淡可以从物体对入射光的光亮反射或透射程度的多少来决定的光亮度，从变化上对于表面来说可从黑色到白色，对于透明色来说是从黑色到无色