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Daytime colorimetry of retroreflective materials
Author(s) -
Terstiege Heinz
Publication year - 1982
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1002/col.5080070408
Subject(s) - standard illuminant , colorimetry , integrating sphere , daytime , optics , calibration , retroreflector , artificial intelligence , computer science , mathematics , physics , statistics , laser , atmospheric sciences
The daytime color of retroreflective materials is a mixture of sensations caused by diffusely reflected light plus a small amount of retroreflected light, the exact mixture depending on the illumination geometry and the goniophotometric characteristics of the material. The most nearly comparable results of color measurement can be obtained with instruments having 45°/0° geometry instead of sphere geometry. Spectrophotometers or colorimeters can be used. The calibration of these instruments is discussed. Most specifications for the daytime color of retroreflective materials call for the use of CIE standard illuminant D 65 . However, one can use colorimeters designed to give color coordinates for illuminant C provided that color standards calibrated for D 65 are used.