Patent ID: 8373897

Claim:
A method of predicting the colors of a print produced by a printing press, comprising the steps of: generating a standard density color chart with the printing press which is set to standard density conditions for producing the print of standard densities, and measuring the standard density color chart to determine standard measured values; generating a first changed density color chart with the printing press which is set to first changed density conditions in which the densities of color materials used to generate the print are individually changed by respective given amounts and the densities of other color materials than the color material with the changed density are fixed to the standard density conditions, and measuring the first changed density color chart to determine first changed measured values; generating a second changed density color chart with the printing press which is set to second changed density conditions in which the densities of color materials used to generate the print are changed by the same given amount, and measuring the second changed density color chart to determine second changed measured values; determining differences between the standard measured values and the first changed measured values for each of the color materials; and determining corrective coefficients for correcting the standard measured values using the differences for the respective color materials to determine the second changed measured values; wherein when desired changed density conditions are established, the colors of the print are predicted using the standard measured values, the differences for the respective color materials which correspond to the changed density conditions, and the corrective coefficients.