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MacAdam MacAdam (1992)
Letter to the Editor: “A paradox! A most ingenious paradox!”Color Res. Appl., 17
Thornton Thornton (1992)
Toward a more accurate and extensible colorimetryColor Res. Appl., 17
W. Thornton (1992)
Toward a more accurate and extensible colorimetry. Part I. Introduction. the visual colorimeter‐spectroradiometer. Experimental resultsColor Research and Application, 17
C 1993 by John Wiley & Sons, Inc. the divergence between these conclusions and what is written in most textbooks on colorâ? As cochairmen of ISCC Committee 49, we are concerned by the recommendations in MacAdamâs last paragraph. Perhaps Thorntonâs results will not be accepted by the CIE, at least in our lifetimes. But we feel that this is just a commentary on the deliberate caution with which the CIE has traditionally operated. Recently, the C l E has provided a clear precedent for the adoption of new and useful results to at least supplement, if not replace, those that have proved useful over the years: the adoption of the CIE 1988 2â spectral luminous efficiency function VM(A) photopic vision, recommended for use instead for of the 1924 V ( h )function when correlates with visual results are required for stimuli with large amounts of shortwavelength r a d i a t i ~ nWhy should it be doubtful that the .~ C I E might, at an appropriate time, adopt new weighting functions based on Thorntonâs work, leading to correct tristimulus values, including those for cases when metamerism is large? Of the other agencies mentioned by MacAdam, the IS0 has so far accepted certain C I E recommendations without question, and neither it nor the AIC have mechanisms to study them experimentally, so their roles are irrelevant with regard to the generation of new results for consideration by the CIE. But the lSCC does have such mechanisms. These have been brought into action in Project Committee 49, with the objective of expanding and corroborating Thorntonâs results. Surely this is just what is needed before the CIE should consider them a s attempts to ârevise colorimetry.â Therefore, we feel it is quite inappropriate for anyone to suggest that the ISCC refrain from doing so. WILLIAM A. THORNTON 27 Harvard Road Cranford, New Jersey 07016 FRED BILLMEYER, . W. JR 1294 Garner Avenue Schenectady, New York 12309 1. David L. MacAdam, Letter to the Editor: âA paradox! A most ingenious paradox!â, Color R e s . Appl. 17, 366 (1992). 2. William A. Thornton, Toward a more accurate and extensible colorimetry, Color K ~ JAppl. 17, 79-122, 162-186, 240-262 (1992). . 3. C l E Publication No. 86, CIE 1988 Sprrrral L~mrino~rs E[ffcirrrcvf.ârrnt.tion ,for Photopic Vision, Central Bureau of the CIE. Vienna, 1990. Received September 4, 1992 CCC 0361-2317/93/010058-03 COLOR research and application
Color Research & Application – Wiley
Published: Feb 1, 1993
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