Patent ID: 8891116

Claim:
A method to control at least one property of a print image printed on a substrate, comprising the steps of: defining a first evaluation period dependent upon a periodic fluctuation of said property; determining a measurement value with aid of an optical sensor which measures said property at least one determination point on the substrate within the first evaluation period, and also determining a position of the at least one determination point within the first evaluation period so that the property measurement value is determined with spatial dependency, said at least one determination point on the substrate within the first evaluation period comprising a printed image mark having a tone value; comparing the determined measurement value with a preset reference value; and depending on a result of the comparison between the determined measurement value and the reference value controlling an inking of the substrate for said print image to control said property in at least one subsequent second evaluation period at a point within the second evaluation period which has a position within said second evaluation period that corresponds to said position of the at least one determination point in said first evaluation period.