Abstract
This paper proposes a new color universal design method without restricting usage of colors and their combinations using dithering technique. A key idea is that a solid color and a dithering of darker and lighter colors which approximate the solid color may look almost similar for people with normal color vision, while they could be distinguishable for people with color vision deficiencies since one is solid and the other is a pattern of dark and light colors. Efficacy of this method has been confirmed through some experiments.
