Please explain the term Duotone?

Submitted by: Muhammad
Duotone is an effect used to give a black & white photographic image that has been given a color tint by duplication of the image onto a second color channel. In Photoshop, there is a command Duotone that changes a grayscale image into a two color Duotone, three color Duotone or four color quad-tone.
Submitted by: Muhammad

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