Abstract: A method of controlling the quality of printed products by using a computer includes always producing multiple printed products with at least partially identical image content in a printing machine in a course of a print job to be completed. The multiple printed products are recorded by at least one image sensor and are sent to the computer as digital image data. The computer examines and assesses the digital image data in an image inspection process to find print defects and to sort out printed products that have been found to be unusable. The computer assesses the identical image content of the digital image data of at least two consecutive printed products and only takes into consideration such detected print defects that are present on the at least two assessed consecutive printed products.

Abstract: A method prepares a print job for a printing operation and includes providing at least one first data set associated with the print job and multiple reference data sets associated with reference jobs. The method is characterized in that it contains the steps of providing multiple mutually complementary data sets for each one of a plurality of reference jobs, automatically filtering the reference data sets of the plurality of reference jobs to provide at least one second data set, and using the second data set in the printing operation as a replacement of or an addition to the at least one first data set. The method provides a way of manufacturing high-quality printed products while saving time, e.g. makeready time for the printing operation, and costs, e.g. caused by unusable prints or low-quality prints.

Abstract: A method prepares a print job for a printing operation and includes providing at least one first data set associated with the print job and multiple reference data sets associated with reference jobs. The method is characterized in that it contains the steps of providing multiple mutually complementary data sets for each one of a plurality of reference jobs, automatically filtering the reference data sets of the plurality of reference jobs to provide at least one second data set, and using the second data set in the printing operation as a replacement of or an addition to the at least one first data set. The method provides a way of manufacturing high-quality printed products while saving time, e.g. makeready time for the printing operation, and costs, e.g. caused by unusable prints or low-quality prints.

Abstract: A method of controlling the quality of printed products by using a computer includes always producing multiple printed products with at least partially identical image content in a printing machine in a course of a print job to be completed. The multiple printed products are recorded by at least one image sensor and are sent to the computer as digital image data. The computer examines and assesses the digital image data in an image inspection process to find print defects and to sort out printed products that have been found to be unusable. The computer assesses the identical image content of the digital image data of at least two consecutive printed products and only takes into consideration such detected print defects that are present on the at least two assessed consecutive printed products.