A component of the Prinect workflow concept designed by Heidelberger Druckmaschinen AG, which is the world's only quality assurance system in the print process that measures complete print sheets using spectrophotometric technology. After comparing the results with the values of the OK sheet, the color deviations that have been identified are fed online to the press in order to adjust the ink zone settings. This method processes a thousand times more information than is possible using print control strips.