PRE-PRINTING CONFIRMATION METHOD AND APPARATUS OF PICTURE COLOR TONE FOR PRINTING PRESS, PLATE MAKING METHOD, AND PICTURE COLOR TONE CONTROLLING METHOD AND APPARATUS FOR PRINTING PRESS

摘要

The invention relates to picture color tone control for a printing press, and it is an object of the invention to make it possible to confirm a color shade before printing is performed thereby to prevent failure in printing and suppress incidence of paper loss. A device profile of a printing press to be used for printing is acquired, and a device profile of a simulation printing tool is acquired and plate making data is acquired. Then, the device profile of the printing press is used to convert tone value data k, c, m, y of the plate making data into color coordinates (L*a*b*), and color coordinates (L*a*b*) obtained by conversion using the device profile of the simulation printing too are outputted with densities according to densities R, G, B from the simulation printing tool. Then, it is decided whether or not the color shade of the output is within a permissible range. Plate making and picture color tone control of the printing press are performed based on a result of the decision.