We investigate a new approach for reproducing color images. Rather than mapping the colors in an image onto the gamut of colors that can be printed with cyan, magenta, yellow, and black inks, we choose the set of printing inks for the particular image being reproduced. In this paper, we look at the special case of selecting inks for duotone printing, a relatively inexpensive process in which just two inks are used. Specifically, the system we describe takes an image as input, and allows a user to select 0, 1, or 2 inks. It then chooses the remaining ink or inks so as to reproduce the image as accurately as possible and produces the appropriate color separations automatically. CR Categories: I.3.4 [Computer Graphics]: Graphics Utilities Additional Keywords: color reproduction, color printing, duotone, gamut mapping, Neugebauer model 1 Introduction Modern color reproduction typically employs a fixed set of processcolor inks: cyan, magenta, yellow, and sometimes black. Placed on top ...