Wow! Thank's Eric for graciously sharing your knowledge about the D series.
> 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.
Several years in the '70s? Interesting. I wonder if they took more readings
during summertime or spreaded their readings evenly throughout the year.
> The measurement data
> were carefully measured absolutely spectroradiometrically off sky reflected
> NBS-traceable (now NIST) white tiles,
Gee, this is the same technique used in the Spectrocam!
> then analyzed and decomposed into two
> basis functions. These basis functions are linearly recombined with different
> weighting functions to produce the D-series illuminants.
Love it.
> Thanks,
> Eric Walowit
> Tahoe
Roger Breton
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