Re: On the effect of florescence
Re: On the effect of florescence
- Subject: Re: On the effect of florescence
- From: Roger Breton <email@hidden>
- Date: Wed, 02 Mar 2005 14:49:51 -0500
> The
> paper's FWA produced a peak at 440 nm and here are the measured results
> from the experiment:
>
> Filter 440 nm reflectance
> -------------------------------------
> Null 1.028
> D65 1.133
> UV Cut 0.891
>
> Robin Myers
I just measured some Navajo laser paper for a client, with my unfiltered
EyeOnePro, and I too am seeing a peak in the spectrum at that exact
wavelength of 440nm, at which the reflectance is 1.0808. Very close to your
Null above of 1.028.
FWIW, that translates to Lab = 96.4 1.63 -5.5. Quite blue in appearance.
With a UV-cut filter, you say, the UV component of my EyeOnePro tungsten
lighting is effectively absorbed? Never reaching the paper? Therefore never
having the opportunity of exciting the FWA presen in that paper. Obviously,
the ensuing spectral reflectance at 440nm should be much lower than 1.0828.
This being said, is it possible in your opinion to simulate successfully, in
software, the effect of a UV filter through some attenuation of the spectral
data? I know PMP 4+ and PO5 offer an option to do so. But I never had the
chance to compare the effect of real UV filtering with that software
'filtering' technique. To what extent, does is this technique able to
emulate the effect of a real optical filter?
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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