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Duotone (sometimes also known asDuplex) is ahalftone reproduction of an image using the superimposition of one contrasting color halftone over another color halftone.[1] This is most often used to bring out middle tones and highlights of an image. Traditionally the superimposed contrasting halftone color is black and the most commonly implemented colors are blue, yellow, brown, and red, however there are many varieties of color combinations used.[2]
Due to recent advances in technology, duotones, tritones, and quadtones can be easily created using image manipulation programs. Duotone color mode in AdobePhotoshop computes the highlights and middle tones of amonochrome (grayscale orblack-and-white) image in one color, and allows the user to choose any color as the second color.
A fake duotone, or duograph, is done by printing a single color with a one-color halftone over it.[3] This process is generally not preferred over a regular duotone, as it loses much of the contrast of the image but it is easier and faster to create.[4]
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