| 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.
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