Method for matching a colour formulation

Details Method for matching a colour formulation Method for matching a colour formulation

1997-08-21

1999-07-27

Evans, F. L.

Optics: measuring and testing

By shade or color

Tristimulus examination

356425, G01J 350

Patent

active

059299983

ABSTRACT:
This invention relates to a method for matching a color formulation to a color shade model in the field of a color- and/or effect-imparting surface coating. The reflecting surface of a color shade, which is to be rematched, of a colored surface coating is determined metrologically over the visible spectral region using a goniometric spectral photometer with variation of the angle of measurement. The associated standard tristimulus values and/or the vectors in the CIELAB color solid which are derived therefrom are calculated from the measured reflection factors or spectral energy factors. Those formulations and/or color shades which exhibit reflection properties or properties derived therefrom which are the most similar to the measured color shade model are subsequently identified from a formulation database by means of the reflection spectra or the calorimetric dimensional numbers derived therefrom. By means of a computer-generated effect matrix, the metrologically determined, angle-dependent color difference between the desired color shade, i.e. the color shade to be rematched, and the actual color shade, i.e. the color shade corresponding to the nearest formulation from the formulation database, is minimized by means of a computer algorithm for function minimization taking into consideration secondary conditions in the sense of the L.sub.2 standard, and a corrected formulation is produced.

REFERENCES:
patent: 3601589 (1971-08-01), McCarty
patent: 3916168 (1975-10-01), McCarty et al.
patent: 5668633 (1997-09-01), Cheetam et al.
patent: 5740078 (1998-04-01), Cheetam et al.

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