Re: Color Mixing (Pigment) question

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

Vickie's  citing of (presumably) narrow band filters allows one to make
some sort of estimate of the Q of a specimen filter.
Suppose that 130 filters single peak across the visible
spectrum 400 to 700 nm: one filter would occupy about 300/130 nm
or 2.3 nm, allowing one to suggest a Q laround  550/2.3 or 240
- though the double peaks she mentions already give the lie to the details
of this estimate.

It is apparent that the world where an orange pigment mixed with a yellow
pigment make a black pigment lives only in the world of the physicist
who it seems does not always distinguish those models from reality.
(What do you call a man who hears non existent voices?  -  mad:
what do you call a man who sees non existent color mixes? - a physicist!  :-)

Mike's reflection  spectrometer would be a helpful approach to the question:
are there single peaked color pigments? What is their Q?

Brian Whatcott


At 11:58 PM 5/19/2004, you wrote:
>  Arbor Scientific sells a very nifty set of 130 color filter samples, each
> with a nice graph of its color spectrum.  The filters are theater gels about
> 3/4" by 3" in size.  The set is bound together with a post at one end so you
> can fan out the filters.  The whole thing is pocket-sized.  It's interesting
> to compare the spectrum graphs with the colors that you see. For example, a
> green filter might not pass green wavelengths at all...just blue & yellow.
> You can also make combos of filters by overlapping different ones.
>
> Vickie


Brian Whatcott    Altus OK    Eureka!