Viewed on a CIE (Commission Internationale de l’Eclairage) chromaticity diagram, the color gamut of an RGB device does not align with the color gamut of CMY printing devices. Indeed, the gamuts of different printing devices are unlikely to align. To cross-render images for a special issue of Color Research and Application [1], the authors developed transformations of color coordinate values. They report their experience extensively and blend information about color graphics and graphic arts and printing. Much of the beginning of this paper is a tutorial about printing color halftone images and techniques for instrumentation, calibration, and measurement of color gamuts. Much of the ending consists of a discussion and tables about the variation in the printing experiments. Each color mapping is a linear transformation with possible projective clipping. Each mapping maintains black, scales colors to fill the target gamut, rotates (aligns) the gray axis, and scales for good luminance. The paper is very readable; it is illustrated with numerous diagrams and three example images.