INFLUENCE OF THE DESIGN OF INSTRUMENTS ON THE ACCURACY OF COLOR-DIFFERENCE AND COLOR-MATCHING CALCULATIONS

In color-difference calculations for samples with extremely high metamerism (uncommon in practice), an influence of the band width of the instrument or the number of measurement points is noticeable. In color-matching calculations for samples with steep reflectance factor curves, the error caused by the instrument design can be up to four CIELAB units between the sample and its calculated match. For common samples, the deviations caused by laboratory work (sample preparation) or other factors, such as by pigment flocculation, are greater. If one calculates the color strength of a pigment from K value at reflectance minimum, the results can be affected by the band width of the monochromator.