I have a reflectance spectrum of a soil sample. Can you help me convert this reflectance to CIE X,Y,Z and then to Munsell HVC?
First, note that this answer is not specific to soil samples, and will generally work for any reflectance values. The basic computation is to multiply your sample reflectance by the spectral power distribution of an illuminant (I would recommend CIE illuminants C or D65, average daylight, since you are interested in Munsell designations) and each of the three CIE 1931 color matching functions (x-bar, y-bar, and z-bar). You then sum these products across the spectrum and multiply each by 100 divided by the sum of y-bar times the illuminant. This gives you relative XYZ tristimulus values. The only way to convert to Munsell designations is to use a look-up table since the Munsell notations are not related to CIE tristimulus values by simple mathematical formulae. Fortunately, GretagMacbeth provides free software for this part of the conversion. For a reference on the calculation of CIE tristiumulus values, XYZ, I would recommend Roy Berns’ text, Principles of Color Technology, 3rd Ed. If
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