Printing duotones

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You can create monotones, duotones, tritones, and quadtones in Photoshop. Monotones are grayscale images printed with a single, nonblack ink. Duotones, tritones, and quadtones are grayscale images printed with two, three, and four inks. In these images, colored inks, rather than different shades of gray, are used to reproduce tinted grays. For the purposes of this discussion, duotone refers to monotones, tritones, and quadtones as well as duotones.