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Posted by Martin Heffels on 07/03/06 20:49
On Mon, 03 Jul 2006 01:28:32 GMT, "PTravel" <ptravel@travelersvideo.com>
wrote:
>It should be possible to mathematically expand
>the departure from the "pure" color of the sodium lamp to produce a false,
>but more varied, color spectrum.
That is a "simple" secondary colour-correction, where you can change the
gamma, saturation, hue etc of a colour within a certain range. But you know
from colour-correcting, that if you try to "pull-up" a dark bit, this goes
with the introduction of noise.
>The key, here, is that the sodium vapor
>lamp contains impurities and does output light only at the single spectrum
>for Na.
If you look at the graphs in
http://www.cis.rit.edu/~ejipci/Reports/SpectralDist_of_Sources.pdf you will
see spikes at different parts in the spectrum as well, which would reflect
on the matching colours.
cheers
-martin-
--
"If he can he'll smile 'cos he's a Royal Crocodile."
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