autotypical color mixture, halftone color synthesis

autotypical color mixture, halftone color synthesis (In French synthèse autotypique) optical effect combination of additive and physical color mixtures of transparent to opaque inks when they are printed adjacently or partly overlapping, in the form of periodical (AM) or non-periodical (FM) screens. The additive mixing effect (preferably adjacent printing) diminishes as the absorptive mixing effect (preferably superimposed printing) increases. The basic colors in the standard process are the additive secondary colors Cyan], Magenta] and Yellow plus drawing black Key and paper white White – described for the first time in the “Neugebauer equations” (see History); standard process mixed colors are M+Y=Red orange, C+Y=Green and C+M=Blue violet, C+M+Y=Gray. The effect is also displaced by effects of light diffusion (absorptionto-scatter ratio).