1. Method to detect any register errors in the lateral or “crosstrack” direction, in multicolor printing by a sensor device 70 for detection of at least one registration mark ( 10, 11, 12, 13, 20, 21, 22, 23, and 30 ) arranged in registration mark areas ( 50 ), characterized by the detection of sensor values of registration mark areas ( 50 ) as an arrangement of triangular registration marks ( 10, 11, 12, 13, 20, 21, 22, 23, and 30 ) with a sensor of the sensor device ( 70 ), such detecting of sensor values being the counting of clock pulses where each counting cycle of clock pulses for detecting sensor values begins with a light/dark transition of a registration mark ( 10, 11, 12, 13, 20, 21, 22, 23, and 30 ) and ends with a light/dark transition of such registration mark ( 10, 11, 12, 13, 20, 21, 22, 23, and 30 ), whereby a color separation is assigned to each triangle during multicolor printing and images of respective differential values are formed from the sensor values.