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(graphic arts)
A process in which two halftone cuts, one with a screen angle 30° different from the other, are made from the same black-and-white photograph, and the picture is printed in two tones, usually black and a color such as blue or green.



two-color reproduction from a monochromatic halftone original (for example, a black-and-white photograph). Two screen negatives are made from such an original, without using a light filter; one of the negatives has higher contrast, and the other is softer. The first negative is photographed with the screen in the normal position; the other, with the screen rotated through 30°-45°. The plate from the negative with higher contrast is used to print in black (the contour plate), and the plate from the second negative is used to print in colored ink, usually pale yellow, blue, or green. The rotation of the screen when photographing causes a shift of the points of the screen of the first plate with respect to the points of the second plate; as a result, moiré does not occur and the screen points of one color do not overlap those of the second upon printing. Duotone intensifies the effect of a monochromatic halftone image.

References in periodicals archive ?
IF YOU WANT TO GET AHEAD: Duotone are at Taylor Johns next Thursday
But he also pleaded conversely over 'the long facade', with its duotone brick 'yet shocking disorder', where 'every window is in the middle of its respective inner wall'.
99 pounds T-shirt called Duotone Collage has four Andy Warhol-style Subo images in bright colours.
99 T-shirt called Duotone Collage has four Andy Warhol style SuBo images in bright colours.
What instinct caused you to choose blue/black duotone to represent the photograph on the cover, conveying coldness, sorrow, and despair?
Seren have gone to the top with Magnum photographer David Hurn's Living in Wales - duotone shots of Welsh greats - Bryn Terfel, Colin Jackson, Peter Hain.
Some 70 duotone photos with captains record outbuildings, abandoned farms, and the failure of early homesteading in this powerful testimonial.
The duotone illustrations are sharp and clear, as are the color-plates at the beginning of each volume.
The use of the "cropping" and "cloning tools," the levels palette, image contrast and color adjustment were discussed, along with the introduction of filters and conversions of the color images to black-and-white or duotone images.
The original specification for the Adam catalogue was modelled on that developed for other catalogues of the museum's drawings collection--impressive, scholarly volumes in hardback, with black-and-white illustrations and duotone covers, themselves based on the acclaimed catalogues of the Royal Institute of British Architects Drawings Collection, produced (with admirable speed) in the 1970s.
When DAV ships its return address label premium packages its letters might contain the organization's branded colors, a little red, white and blue in the header with a letter and a photo that is generally duotone.