Cousin Ricky wrote:
> I used CIE.inc from LightsysIV to display black body colors at various
> temperatures.  As the temperature increased, I expected the color to be
come
> yellower before it turned white.  Instead, I could not discern any chan
ge in
> hue.
> 
> I figured that the change in hue might be too subtle for me to detect, 
so I
> #debugged the hues.  Too my surprise, after becoming slightly yellower,
 the hue
> doubled back on itself and got redder, then onto magenta, violet, and b
lue.
> 
> Is this right?  If so, why do candle flames (glowing soot particles) lo
ok
> yellower than glowing coals?  Could it be a whitepoint issue?  Floating
 point
> accuracy?  That warning that splines are an experimental feature?
> 
> The attached image shows my results, with a fully-saturated swatch to t
he lower
> right of each sample.
> _______________________________________________________________________
_________
> 
	Looks right to me, the color goes from red (cool) to blue (hot),
going through yellow and magenta:
http://en.wikipedia.org/wiki/File:PlanckianLocus.png (the magenta
appears white on this image).

		Jerome
-- 
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