Traditionally, CMYK (cyan, magenta, yellow and black) inks are featured in printers, as this enables effective mono and color document printing. Dual photo/document printers sometimes feature both dye-based and pigment-based black inks. The dye-based black ink enables greater depth and contrast than relying on ‘composite black’, created from mixing cyan, magenta and yellow together. Up-market photo printers tend to feature additional colors of ink, often light cyan and light magenta, for an extended gamut (or color space), and top-notch ones usually feature additional gray cartridges to extend the tonal range and drama for black & white photo prints.