Tone and Color Control in Duotone Reproduction.

When duotones are made arbitrarily, their success depends largely on chance, if not on costly remakes. In this paper, the point is made that good duotone reproduction can be attributed primarily to proper tone reproduction and desirable color rendition. These two subjective criteria can be expressed graphically for a given original copy when materials, i.e., inks, paper, press, etc., are specified. Operationally, a duotone chart is devised to solicit specific printing conditions. Further, these two duotone criteria can be translated into halftone requirement by an analytic method. The strategy of the method is given. Halftone operations using the halftone exposure programming for three-point control are explained. Duotones made with various ink combinations are discussed. The significance of the method is that duotone qualities can be predetermined graphically and accessed analytically from the defined criteria. criteria can be translated into halftone requirement by an analytic method. The strategy of the method is given. Halftone operations using the halftone exposure programming for three-point control are explained. Duotones made with various ink combinations are discussed. The significance of the method is that duotone qualities can be predetermined graphically and accessed analytically from the defined criteria.