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Response to MacAdam's letter to the editor

Response to MacAdam's letter to the editor C 1993 by John Wiley & Sons, Inc. the divergence between these conclusions and what is written in most textbooks on color’? As cochairmen of ISCC Committee 49, we are concerned by the recommendations in MacAdam’s last paragraph. Perhaps Thornton’s 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 2” 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 Thornton’s 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 Thornton’s results. Surely this is just what is needed before the CIE should consider them a s attempts to “revise colorimetry.” 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: “A paradox! A most ingenious paradox!”, 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.‘rrnt.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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Color Research & Application Wiley

Response to MacAdam's letter to the editor

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References (3)

Publisher
Wiley
Copyright
Copyright © 1993 Wiley Periodicals, Inc., A Wiley Company
ISSN
0361-2317
eISSN
1520-6378
DOI
10.1002/col.5080180110
Publisher site
See Article on Publisher Site

Abstract

C 1993 by John Wiley & Sons, Inc. the divergence between these conclusions and what is written in most textbooks on color’? As cochairmen of ISCC Committee 49, we are concerned by the recommendations in MacAdam’s last paragraph. Perhaps Thornton’s 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 2” 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 Thornton’s 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 Thornton’s results. Surely this is just what is needed before the CIE should consider them a s attempts to “revise colorimetry.” 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: “A paradox! A most ingenious paradox!”, 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.‘rrnt.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

Journal

Color Research & ApplicationWiley

Published: Feb 1, 1993

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