mgfilt, degree Kelvin into spectral data

radiance-general
1

Hi there,

···

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..."There's no release date for a Cygwin version"...
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@ Peter: Thank you for the information, what a pitty your programm looks quite handy. I always have problems with
this view direction vector under rvu.

Another question @all:
I use "mgfilt" for conversions of degree Kelvin into spectral data.
e.g.
mgfilt c,cspec
cct 2750
cspec 380 780 0.0673 0.0841 0.1038 0.1262 0.1516 0.1801 0.2116 0.2463 0.2841 0.3251 0.3689 0.4157 0.4653 0.5173 0.5719 0.6286 0.6873 0.7479 0.8100 0.8734 0.9379 1.0035 1.0695 1.1362 1.2028 1.2695 1.3359 1.4022 1.4675 1.5322 1.5961 1.6589 1.7206 1.7808 1.8396 1.8968 1.9525 2.0064 2.0584 2.1089 2.1572

How can it be that there are values above 1? Can there be more than 100% "emission" at a certain wavelength interval?
I didn't find any documentation on the mgfilt programm, is there one?

Thanks again,

Christian

--
Christian Fusenig
Diplomand, Medientechnik
Undergraduate, Media Technology
Hamburg University Of Applied Sciences
http://www.mt.haw-hamburg.de

address: Beim Schlump 27/07
              20144 Hamburg

email: christian_fusenig@gmx.de

mobile: ++49 179 5975845

2

Hi Christian,

The normalization of the spectral power distribution is unimportant, but I believe mgfilt outputs something that sums to 1.0 when integrated with the photopic curve. Whatever it comes out to, the actual value is normalized by the reflectance or emission it's applied to. Since you aren't applying it to anything, it doesn't matter.

Spectral power per wavelength can be any non-negative value (0 to infinity). See also the previous thread entitled "specifying sources".

-Greg

···

From: Christian Fusenig <christian_fusenig@gmx.de>
Date: April 4, 2006 3:36:10 AM PDT
...
Another question @all:
I use "mgfilt" for conversions of degree Kelvin into spectral data.
e.g.
mgfilt c,cspec
cct 2750
cspec 380 780 0.0673 0.0841 0.1038 0.1262 0.1516 0.1801 0.2116 0.2463 0.2841 0.3251 0.3689 0.4157 0.4653 0.5173 0.5719 0.6286 0.6873 0.7479 0.8100 0.8734 0.9379 1.0035 1.0695 1.1362 1.2028 1.2695 1.3359 1.4022 1.4675 1.5322 1.5961 1.6589 1.7206 1.7808 1.8396 1.8968 1.9525 2.0064 2.0584 2.1089 2.1572

How can it be that there are values above 1? Can there be more than 100% "emission" at a certain wavelength interval?
I didn't find any documentation on the mgfilt programm, is there one?

Thanks again,

Christian