April 2013
Beginner
480 pages
19h 28m
English
Content preview from Basic Photographic Materials and Processes, 3rd Edition
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appendix D
Tristimulus Value and Chromaticity Coordinate Calculations
To determine the tristimulus values X, Y, and Z for an object, the spectral power distribution of the illuminant, Sλ, the object's spectral reflectance factor, Rλ, and the CIE standard observer color-matching functions, xλ, yλ, and zλ, are integrated together as follows:
The S, R and either, x, y, and z, are multiplied together at each wavelength sampled. The Δλ represents the wavelength interval that measurements are made at. Although the interval can vary, it is usually 10 or 20 nanometers for objects. The £λ indicates that the products of multiplications are summed across ...
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