The present invention relates to a novel active compound combination that is highly suitable for controlling phytopathogenic fungi which contains the known 8-tert-butyl-1,4-dioxaspiro4. An embodiment includes an integrated circuit implementing multiplicative division of a dividend input and a divisor input. A second halftone pattern, which also appears as stochastically distributed dots and is spatially displaced from the first halftone pattern, is generated in at least one or more different color separations. A low pass output filter is coupled to a sum of an output of the first DAC and an output of the second DAC.