Patent ID: 6539863
Filing Date: 2003-04-01
Classification: B41F,B41P

Abstract:
A printing press for printing an image on a printing sheet on the basis of first image data, comprising:plate making means for forming said image on a printing plate on the basis of said first image data, ink feed means capable of changing ink feed rates of ink supplied onto a plurality of regions of said printing plate, reference color data operating means for converting said first image data into a predetermined color coordinate system for each one of said plurality of regions, and storing color values obtained as reference color data, image-detecting means for detecting said image 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 for each one of said plurality of regions to obtain print color data, differential data operating means for comparing said reference color data with said print color data for each one of said plurality of regions to obtain differential data, correction data operating means for obtaining correction data for said ink feed rates on the basis of said differential data, and control means for controlling said ink feed rates to be fed onto said plurality of regions by said ink feed means on the basis of said correction data.