This is a C# port of the C code to be found on John Walker's webpage titled Colour Rendering of Spectra. The code can be used to compute RGB values for temperatures based on a Black-Body-Model. It is a C# port of the original C-program "specrend.c".

Please do not bother the original author with questions regarding the C# version.

I did not do any original research on the topic. I did not intent to modify any logic. I cannot guarantee that i did not make mistakes while porting it. Like the original this program is in the public domain

The following is the original Copyright message from specrend.c (slightly reformatted)

Last updated: March 9, 2003

This program is in the public domain.

For complete information about the techniques employed in this program, see the World-Wide Web document:

http://www.fourmilab.ch/documents/specrend/

The xyz_to_rgb() function, which was wrong in the original version of this program, was corrected by:

Andrew J. S. Hamilton 21 May 1999
[email protected]
http://casa.colorado.edu/~ajsh/

who also added the gamma correction facilities and modified constrain_rgb() to work by desaturating the colour by adding white.

A program which uses these functions to plot CIE "tongue" diagrams called "ppmcie" is included in the Netpbm graphics toolkit:

http://netpbm.sourceforge.net/

(The program was called cietoppm in earlier versions of Netpbm.)