By David L. MacAdam

Stories and use of the 1st variation because the textbook for a senior-division uni­ versity direction indicated the necessity for a few corrections and clarifica­ tions. even though no new issues were brought, the recent variation can be extra transparent and important. A novelty within the Notes and resources Appendix may still facilitate reference from the notes again to the textual content. a long way that goal, the web page variety of the textual content to which every notice refers is indicated in sq. brackets following the serial variety of the notice. The FMC1 color-difference formulation has been substituted in every single place for the Friele-MacAdam formulation, together with the connection with the resources in observe fifty two. The FMC1 formulation was once really utilized in the investigations reviewed in Sects. 8.3 and 8.4. The Friele-MacAdam formulation given on web page 151 of the 1st variation, which i presumed was once akin to the FMC1, was once inaccurate and shouldn't be used. The formulation for the geodesic chromaticity diagram, on p. 153 of the 1st version, have been in keeping with observations by way of 14 basic observers (last reference in notice 51). they've been changed by way of the formulation in line with the observations of PON, for consistency with all different formulation and discussions within the ebook. determine 8.29 within the first variation was once in response to the PON facts and at the formulation revealed less than it within the new version. for this reason, Fig. 8.29 is un­ replaced.

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Extra info for Color Measurement: Theme and Variations

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A surface that approaches closely the conditions of specular reflection is ordinarily said to be glossy; one that approaches more closely the conditions of diffuse reflection is said to be matte. Every color specification should be accompanied by a statement of the geometry of the illuminating beam and the geometry of that portion of the reflected (or transmitted) beam that is evaluated in the measurement. There is no conclusive reason for mandating any particular mode of illumination and observation.

3 Complementary Colors When the line that joins the points that represent the two components passes through the white point, the components and their dominant wavelengths are 50 4. Color Mixture said to be complementary. 1 gives a list of pairs of complementary dominant wavelengths, when the CIE illuminant C is taken as white. 1. 4 Photometric Relations Between Complementary Colors 51 produce a mixture whose chromaticity coordinates are the same as those of illuminant C.

QJ ~ { II 80 0 70 QJ > 60 c;; 50 / '" "'- Co "0 0:: '" 40 30 20 10 400 500 600 700 Fig. 4 Spectral distribution of power in sunlight outside the earth's atmosphere Wavelength {nml On a clear day, solar radiation is scattered selectively in its passage through the earth's atmosphere. This selective scattering causes the sky to be blue and causes the intensities of short wavelengths to be correspondingly reduced in the residual direct beam. At noon on a clear summer day, the illumination on a horizontal surface due to direct sunlight is approximately 80,000 lumens per square meter and that due to the diffuse skylight is about 20,000 lumens per square meter.

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