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The Physical Basis of Color Specification
Sources of Light
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600 Wavelength nm apeiron axis beam blackbody locus blue calculated chromatic adaptation chromaticity coordinates chromaticity diagram chromaticity differences CIE 1931 observer color constancy color differences color-matching data color-rendering index colorimetry combination complementary wavelength components computed concentration constant correlated color temperature corresponding D. L. MacAdam daylight density determined dominant wavelength dyes ellipses equal filters Friele gaussian quadrature geodesics indicated in Fig lamp linear lumens luminance factor luminous efficiency match measured multiplied Munsell nanometers nearly nm intervals nonlinear observer and illuminant obtained optical orthogonal color-matching functions pairs pigment point that represents produced purity purple radiation ratio sample Sect selected ordinates selected-ordinate method shown in Fig Simpson's rule spectral distribution spectral power distribution spectral reflectance spectral transmittance spectrophotometric curve spectrophotometric data spectrum colors spectrum locus standard straight line surface Table tristimulus values tungsten uniform color scales visual weighted-ordinate method x,y diagram yellow zero