[Radiance-general] change image color temperature

[Giovanni Betti]

Dear List,

 

I have a problem that I hope the radiance community can help me
understand.

 

Assume you have simulated a scene with artificial light and you have set
the colour of the light to true white (R=G=B; approximate colour
temperature 6500k).

I assume it should be possible in postprocessing to alter the colour
temperature of the light source and of the scene (assuming that's the
only light source) using some pcomb expression (different coefficients
for the RGB coordinates). 

Does anybody have any pointer to the math required to calculate the
coefficient to change the light source from, say, 6500K to 3000K?

 

Thanks in advance,

 

Giovanni

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