Duotone
Videos
Duotone is a halftone reproduction of an image using the superimposition of one contrasting color halftone over another color halftone. This is most often used to bring out middle tones and highlights
A duotone image, made using black and blue in Photoshop
Color printing
Videos
Color printing or colour printing is the reproduction of an image or text in color.
Duotone
…Printmaking Color separation Luminous Landscape Duotone Article…
Bijin (beautiful woman) ukiyo-e by Keisai Eisen, before 1848
Philibert-Louis Debucourt, The Public Promenade, 1792. Printed in color from various plates, using etching, engraving, and aquatint. One of the leading achievements of the French 18th-century color-print.
Two-color (red/blue) advertising
The first widely reproduced image printed using the three-color process, by William Kurtz (January 1893)