
1) Bicolor 2) Of two tones or colors 3) Photoshop color effect 4) Two-color 5) Two-hued picture
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https://www.crosswordclues.com/clue/duotone

Duotone is a halftone reproduction of an image using the superimposition of one contrasting colour halftone (traditionally black) over another color halftone. This is most often used to bring out middle tones and highlights of an image. The most commonly implemented colours are blue, yellow, brown and red. Now due to recent advances in technology,...
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http://en.wikipedia.org/wiki/Duotone

• (n.) Any picture printed in two shades of the same color, as duotypes and duographs are usually printed.
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http://thinkexist.com/dictionary/meaning/duotone/

Photograph reproduced from two halftone negatives and usually printed in two ink colors.
Found on
http://www.e-printing.co.uk/glossary.htm

A two-colour halftone of the same images created with two screens, two plates, and two colours. Most halftones are one-colour halftones, printed with black ink on white paper. By blending the black of the tiny ink dots and the white of the paper, the human eye sees shades of grey. Printing an image with two colours, generally black and a second col...
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http://www.encyclo.co.uk/local/20829

A two-colour halftone sometimes used in Two Colour Printing. Produces a tinted effect using a black & white original.
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http://www.encyclo.co.uk/visitor-contributions.php

A method of enhancing a mono image using two colours.
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http://www.encyclo.co.uk/visitor-contributions.php
Du'o·tone noun [ Latin
duo two +
tone .]
(Photoengraving) Any picture printed in two shades of the same color, as duotypes and duographs are usually printed.
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http://www.encyclo.co.uk/webster/D/132

Black-and-white photograph reproduced using two halftone negatives, each shot to emphasize different tonal values in the original.
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https://www.encyclo.co.uk/local/20631

Color reproduction from monochrome original. Keyplate usually printed in dark color for detail, second plate printed in light flat tints. A two-color halftone reproduction generated from a one-color photo.
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https://www.encyclo.co.uk/local/22539

of two tones or colors.
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https://www.infoplease.com/dictionary/duotone

A two-color reproduction of a single-color image or a grayscale image that is printed using two plates to enhance its tonal depth.
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https://www.xrite.com/learning/other-resources/glossary
No exact match found.