Method Of Controlling Quality Of Printed Images Of Color Printing Press And Apparatus For Controlling Quality Of Printed Images

摘要

An object is to securely prevent incorrect reproduction of a highlight portion and an intermediate portion due to the change in condition of the printing press and incorrect reproduction of a shadow portion. The printing press includes a measuring means 12 for measuring the solid densities and the gray balance, of a printed color print image; a computing means 13 for computing respectively the differences between the solid density values and the gray balance measured by the measuring means 12 and their target values; a correction-value-computing means 14 for computing the correct values based on their differences respectively computed by the computing means 13; and an ink-supply-amount-adjusting means 15 for adjusting the amount of the ink of each of the basic colors to be supplied through each of plural ink fountain keys, based on the correction values computed by the correction-value-computing means 14.