Re: Colour Correction

[T3D John W Roberts <roberts@xxxxxxxxxxxxxxxxx>]

John Bercovitz writes:
>Bob A writes:
>> I guess that viewer bulb colour temperature is something of an illusion.
 
>To a point, certainly.  But if the light is red enough (low enough in 
>temperature), you can't see all the colors.  I presume if the color temp
>were high enough, you'd have the same sort of problem.

I don't think it would be too bad at high temperatures with real black body
radiation. As the temperature of a black body approaches infinity, the
color never progresses beyond a sort of pale bluish-white, and there should
be plenty of red and green in there.

If you go out at night and look at a bright blue-white star such as Rigel
(easier to see the color in a telescope), I imagine that's pretty close
to an "infinite" color temperature.

I've never been comfortable with the idea of mapping colors that are *not*
along the black body curve to "color temperature equivalents". What is the
algorithm used?

John R


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End of TECH3D Digest 19
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