Learn › Glossary › Duotone Design & style Duotone An image made from just two colors, usually a dark and a light. Also called duotones A duotone maps an image’s shadows to one color and its highlights to another. In print it means two inks; on screen it is a popular graphic style. Choosing two colors with strong lightness contrast keeps the image readable. ← PreviousDithering All terms Next →Earth tones