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Long‐term repeatability of color‐measuring instrumentation: Storing numerical standards
Author(s) -
Marcus Robert T.
Publication year - 1978
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.5080030110
Subject(s) - colorimeter , instrumentation (computer programming) , repeatability , color measurement , color difference , colored , computer science , term (time) , set (abstract data type) , reflectivity , weighting , computer graphics (images) , artificial intelligence , computer vision , mathematics , optics , materials science , statistics , acoustics , filter (signal processing) , physics , quantum mechanics , composite material , programming language , operating system
A major problem in the coatings industry is the preparation and maintenance of standards to be used in the shading of colored products. With the introduction of color‐measuring instrumentation interfaced directly to dedicated digital computers, the storing of reflectance data as numerical color standards becomes feasible. For this technique to be practical, the color instrumentation must be stable and repeatable over a long period of time. Long‐term (up to 719 days) repeatability data were obtained for seven Diano Chromascan Colorimeter‐Abridged Spectrophotometers, interfaced to Digital Equipment Corporation PDP/11 computers, by measuring a set of five color‐stable tiles supplied by the instrument manufacturers. Average repeatabilities of below 0.50, 0.25, 0.30, 0.30 and 0.60 FMC‐2 color‐difference units were found for the black, blue, green, yellow, and red tiles which make up the set. Since this is of the same order of magnitude as the uncertainties found for other systems of standards maintenance, the storing of reflectance data for use as numerical standards may be considered as a viable alternative to maintaining physical standards.