Convert frequency to RGB

[Joel Rees]

> If you can read C, look at this:
> 
> http://www.fourmilab.ch/documents/specrend/specrend.c
> 
> It has black body sources, wavelength to xyz (CIE), xyz constrained to 
> rgb and maybe others.  The xyz to rgb uses a method I mentioned and is 
> described here:
> 
> http://www.fourmilab.ch/documents/specrend/

Wow. Neat stuff. I thought someone would have done this. I'm going to
stash this somewhere and hope I don't lose it.

-- 
Joel Rees, programmer, Systems Group
Altech Corporation (Alpsgiken), Osaka, Japan
http://www.alpsgiken.co.jp