THE C.I.E. COLORIMETRIC STANDARDS

THE C.I.E. COLORIMETRIC STANDARDS - Home Search Collections...

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The C.I.E. colorimetric standards and their use This article has been downloaded from IOPscience. Please scroll down to see the full text article. 1931 Trans. Opt. Soc. 33 73 (http://iopscience.iop.org/1475-4878/33/3/301) Download details: IP Address: 134.129.205.137 The article was downloaded on 09/03/2011 at 15:47 Please note that terms and conditions apply. View the table of contents for this issue, or go to the journal homepage for more Home Search Collections Journals About Contact us My IOPscience
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TRANSACTIONS OF THE OPTICAL SOCIETY VOL. XXXIII. 1931-32 No. 3. THE C.I.E. COLORIMETRIC STANDARDS AND THEIR USE BY T. SMITH, M.A., F.INsT.P. (Chairman, C.I.E. Secretariat Committee on Colorimetry for 1928-3 I) AND J. GUILD, A.R.C.S., F.INsT.P., F.R.A.S. (N.P.L. Representative, C.I.E. Secretariat Committee on Colorimetry for MS. received, 4th March, 1932. Read, 14th April, ABSTRACT. The new international standards, which define a standard observer, three standard illuminants, standard conditions of illuminating and viewing opaque specimens, a standard for evaluating the brightness factor of opaque specimens, and a standard trichromatic system for the expression of colour measurements, are stated and their origin explained. In addition to the numerical tables which are appended to the re- solutions setting up these standards, there are given a table specifying the trichromatic coordinates for the standard observer of all spectral colours at wave-length intervals of I mp, tables to facilitate the calculation of the standard coordinates and the brightness factor of a material illuminated by any one of the three standard illuminants from spectro- photometric measurements on the material, and a table giving the coordinates of some stimuli of special importance on the N.P.L. system, the standard system, and another system which occurs in the resolutions. Some new colorimetric terms are proposed, partly to avoid misinterpretation and partly to meet new needs. The theory of colour transformations, and points which arise in the application of the system and in the calibration of instruments, are discussed. - Prefatory note on nomenclature TWO meanings of colour are firmly established in the English language. In one, the subjective sense, it denotes a quality of a visual sensation. In the other, the objective sense, it denotes an attribute of a physical stimulus which is supposed to determine its colour-matching relations to other stimuli. The word is used frequently in scientific discussions with both meanings, and at present the double use can only be avoided by substituting clumsy phrases for one of them. The opt. Soc. XXXIII 5
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74 T. Smith andJ. Guild ambiguity resulting from this double usage seems to have proved an obstacle to the formation of clear conceptions among scientific and technical workers, but proposals for replacing one or other of these meanings by a distinct word in technical papers have not been widely adopted. The most acceptable solution of the difficulty appears to be for writers to use colour in either sense, taking care, whenever uncertainty can arise, to specify the meaning with the precision required.
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This note was uploaded on 03/27/2011 for the course CHEM 2211L taught by Professor T.a. during the Spring '08 term at UGA.

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THE C.I.E. COLORIMETRIC STANDARDS - Home Search Collections...

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