Optical measurement and perception of gloss quality of printed matte-coated paper

A set of 32 commercially produced and printed matte-coated papers were rate d for gloss quality by a panel of 13 expert judges and light-scattering dis tributions, glass and glass variation of the prints were measured. Fitting the light-scattering distributions to Von Mises distributions, we obtain a factor; kappa, related to the width of the distribution and sensitive to sm all changes in surface roughness. This factor relates very well with the su bjective rating. Glass variation in the 3.3 to 6.6mm wavelength band also c orrelates well with the gloss quality rating. The topography of the samples was also measured using confocal microscopy and a good correlation was fou nd between the median facet angle and the kappa values.