Abstract

The gloss of a sample is determined as the ratio of the specular reflectance of the sample to that of a black-glass reference standard for angles of incidence of 20°, 60°, or 85°. The angle of 60° is close to the Brewster angle of the black glass, and it must be expected that the natural polarization of the incident radiation in the gloss meter affects the gloss measurements. Calculations for unpolarized and for partially polarized incident radiation show that in general the gloss value of the black glass changes drastically with increasing degree of polarization but that the gloss value of a sample, determined from the ratio mentioned above, is affected very little, particularly if the refractive index of the sample is close to that of the reference.

© 1979 Optical Society of America

Spatial variant gloss measurement of dielectric materials based on a polarized camera

Tsung-Lin Lu and Tzung-Han Lin
Appl. Opt. 62(32) 8686-8695 (2023)

Design and characterization of a versatile reference instrument for rapid, reproducible specular gloss measurements

Jian Liu, Mario Noël, and Joanne Zwinkels
Appl. Opt. 44(22) 4631-4638 (2005)

Optical characterization of a reference instrument for gloss measurements in both a collimated and a converging beam geometry

Mario Noël, Joanne Zwinkels, and Jian Liu
Appl. Opt. 45(16) 3712-3720 (2006)

High sensitivity optical measurement of skin gloss

Anna Ezerskaia, Arno Ras, Pascal Bloemen, Silvania F. Pereira, H. Paul Urbach, and Babu Varghese
Biomed. Opt. Express 8(9) 3981-3992 (2017)

Gloss as an aspect of the measurement of appearance

Wei Ji, Mike R. Pointer, Ronnier M. Luo, and John Dakin
J. Opt. Soc. Am. A 23(1) 22-33 (2006)