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Duotone is a form of printing halftones with two colors of ink, one usually black.
Duotone is also a generic term for images using a color-separation printing scheme. This is normally a CMYK (Cyan, Magenta, Yellow, and Key (black) ) separation.
Duotone color mode in Photoshop supports between one to four colors of ink. Because home inkjet printers are far better at printing full-color images than black-and-white, many photographers use Photoshop Duotone processing to improve their prints. Photoshop's Duotone mode is also commonly used for creating sepia toned prints, using black and yellow inks, sometimes with a third color.
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