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The Physical Basis of Color Specification
Sources of Light
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additive mixture apeiron axes axis beam blackbody locus blue calculated chromatic adaptation chromaticity coordinates chromaticity diagram chromaticity differences CIE 1931 observer coefficients color constancy color differences color-matching data color-rendering index colorimetry combination complementary wavelength components computed constant correlated color temperature corresponding D. L. MacAdam daylight density determined dominant wavelength dyes ellipses equal filters ﬂuorescent formula gaussian quadrature geodesics indicated in Fig intersection just-noticeable difference linear log K/S lumens luminance factor luminous efficiency match materials measured multiplied Munsell nanometers nearly nm intervals nonlinear observer and illuminant obtained optical orthogonal color-matching functions pairs pigment points that represent purity radiation ratio sample Sect selected ordinates selected-ordinate method shown in Fig specification spectral distribution spectral power distribution spectral transmittance spectrophotometric curve spectrophotometric data spectrum colors spectrum locus standard surface Table tristimulus values tungsten uniform color scales Wavelength nm weighted-ordinate method yellow zero