Hi,
While a student at RIT in the early 80s, one of my professors and color
mentors, the late Dr Franc Grum related the following (as I best I remember 25
years later): The basis functions that are used to determine the D series
illuminants are primarily from measurements made on top of the Kodak building in
Rochester over the course of several years in the 1970s. The measurement data
were carefully measured absolutely spectroradiometrically off sky reflected
NBS-traceable (now NIST) white tiles, then analyzed and decomposed into two
basis functions. These basis functions are linearly recombined with different
weighting functions to produce the D-series illuminants.
Thanks,
Eric Walowit
Tahoe
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