Patent ID: 6684780
Filing Date: 2004-02-03
Classification: B41F,B41P

Abstract:
A printing press for printing sheets on the basis of first image data comprising:plate making means for adding color chart image data expressing a predetermined color chart to said first image data to generate combined image data, and forming an image corresponding to said combined image data on a printing plate, ink feed means capable of changing ink feed rates of ink supplied onto a plurality of regions of said printing plate, reference color data storage means for storing a numerical value of each color included in said color chart in a predetermined color coordinate system as reference color data, image-detecting means for detecting an image of the color chart on said printing sheet transferred from said printing plate to thereby obtain second image data, print color data operating means for converting said second image data into said color coordinate system to obtain print color data, differential data operating means for comparing said reference color data with said print color data to obtain differential data, correction data operating means for obtaining correction data of said ink feed rate with respect to each of said plurality of regions, on the basis of said differential data, and control means for controlling the amount of ink to be fed onto said plurality of regions by said ink feed means on the basis of said correction data.