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.
Hi Lars,
I'm pretty sure mgfilt does its calculation with an equal-energy white, not D65 or any of the other standard illuminants. Try repeating it with EE white to see what you get.
Cheers,
-Greg
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On Nov 15, 2013, at 3:27 PM, "Lars O. Grobe" <[email protected]> wrote:
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.