Black and white photo reproduced using two halftone negatives, each is shot to emphasize different tonal values in original.
Canon glossary us
A black and white (grayscale) image that has a single color added to it. Duo refers to the two colors - black and the other color - that are combined in the image. In printing, two color plates (one black; one a color) are used to print a duotone image.
Cel Mai folosit cuvant: color | Domeniu Aplicare : Fotografie | Caractere: 193 Cuvinte: 51 | Limba: Engleza | Sursa Photo Tips