A RE-DETERMINATION OF THE TRICHROMATIC

A RE-DETERMINATION OF THE TRICHROMATIC - Home Search...

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A re-determination of the trichromatic coefficients of the spectral colours This article has been downloaded from IOPscience. Please scroll down to see the full text article. 1929 Trans. Opt. Soc. 30 141 (http://iopscience.iop.org/1475-4878/30/4/301) 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. xxx. 1928-29. No. 4. A RE-DETERMINATION OF THE TRICHROMATIC COEFFICIENTS THE SPECTRAL COLOURS BY W. D. WRIGHT, A.R.C.S., D.I.C., B.Sc. MS. received, 7th February, 1929. Read and discussed, 14th March, ABSTRACT-Using a new trichromatic colorimeter a series of colour matches through the spectrum has been made by ten observers. The results have been averaged and a mean set of trichromatic coefficients for the spectral colours derived. These results are compared with previous determinations made by Konig and Abney. The variations in the coefficients that have been found amongst the ten observers must, as a consequence of a new method of basing the trichromatic units, be attributed to variations in the process of reception, but their magnitude appears to be of a small order. On the other hand, there are big differences in the amount of the macular pigment in different eyes and probably some variation in its dominant hue. These variations have been investigated by matches on a standard white, results for 36 observers being given in the paper and a mean value determined, This value, combined with the mean spectral coefficients, has been used to compute an average locus for the spectral colours in the colour triangle, with white at the centre. Other points discussed in the paper include the technique of colour matching, the range of intensity over which matches remained valid, and variations of luminosity. INTRODUCTION IN a previous paper” a colorimeter was described which had been designed and built by the author to carry out some researches on col.our vision in the Technical Optics Department of the Imperial College. The present paper describes the first results that have been obtained from observations made by a number of observers, all trichromats. The main results are concerned with the determination of the trichromatic coefficients of the spectral colours, that is to say, the proportions of * W. D. Wright, “A Trichromatic Colorimeter with Spectral Primaries,” Trans. Opt. Soc. 29 1927-8 (225). opt. IUM I1
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W. D. Wright three selected primaries, red, green, and blue, which are required to match the colours ranging through the spectrum. These values determine the positions of the spectral colours in the colour triangle and when combined with relevant luminosity data they may be used to compute the spectral mixtures curves and the sensation curves. A set of sensation curves has been derived, but they are provisional only, as satisfactory luminosity values are not yet available.
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A RE-DETERMINATION OF THE TRICHROMATIC - Home Search...

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