[Radiance-general] color calculations in mgfilt

[Lars O. Grobe]

Hi,

mgfilt is not really part of the core Radiance package, but typically
used with Radiance. So I hope this is not entirely off-topic.

I have been using mgfilt from time to time as a convenient tool for
getting color coordinates from measured reflection spectra. However some
results appeared a bit strange, and thus I did a comparision with what I
get from mgfilt and the results of using the CIE formulae with rcalc
instead. To make it short, the results I got from mgfilt were quite off,
and I am wondering wether I did something wrong or the accuracy
implemented in mgfilt is really that much worse.

I uploaded a short report on the comparison here:

http://static.larsgrobe.de/spec2Yxy-20131115.pdf

Cheers, Lars.