COLOR PREDICTION SYSTEM AND COLOR PREDICTION METHOD

摘要

A color prediction system includes: database storing absorption/scattering coefficients of each primary color ink; sections for: selecting a spot color ink as a combination of primary color inks that reproduce a colorimetric value of a color sample, reading absorption and scattering coefficients of the primary color inks of a reference spot color from the database, obtaining absorption and scattering coefficients of the spot color ink of a specified formulation ratio, and calculating a spectral reflectance of the spot color ink to be reproduced; obtaining a reproduced color from the spectral reflectance; obtaining a difference from the colorimetric value of the color sample and correcting the formulation ratio to calculate a formulation ratio with an allowable difference; and calculating a Neugebauer primary color of overprinted spot color inks from the absorption and scattering coefficients of the spot color inks calculated at formulation ratios determined by the formulation ratio determination section.

主权项

1. A color prediction system comprising:
an absorption/scattering coefficient database in which absorption coefficients and scattering coefficients of primary colors are written and stored in advance; a spot color ink spectral reflectance calculation section that selects a spot color ink configured by combining primary color inks which are preferable for reproducing a colorimetric value measured from a color sample whose color is desired to be reproduced, reads absorption coefficients and scattering coefficients of primary color inks contained in the spot color ink from the absorption/scattering coefficient database, obtains an absorption coefficient and a scattering coefficient of the spot color ink according to a specified formulation ratio, and calculates a spectral reflectance of the spot color ink desired to be reproduced, on the basis of the obtained absorption coefficient and scattering coefficient; a spot color ink reproduction color calculation section that obtains a reproduced color from the spectral reflectance calculated by the spot color ink spectral reflectance calculation section; a spot color ink formulation ratio determination section that obtains a difference from the colorimetric value measured from the color sample, and appropriately corrects the specified formulation ratio to calculate a formulation ratio which allows the difference to fall within a predetermined allowable range; and a spectral data calculation section that calculates a Neugebauer primary color resulting from overprinting the spot color inks, on the basis of the absorption coefficients and scattering coefficients of the spot color inks calculated from the respective formulation ratios of the spot color inks determined by the spot color ink formulation ratio determination section.