Re: On the effect of florescence
Re: On the effect of florescence
- Subject: Re: On the effect of florescence
- From: Graeme Gill <email@hidden>
- Date: Thu, 03 Mar 2005 22:58:09 +1100
- Organization: Argyll CMS
Ken Fleisher wrote:
That's only really possible if you know the details of the FWAs.
Otherwise, it is impossible to separate out what part of your spectral
response curves are due to the inks/dyes and what part are due to the
FWAs. Without knowing the specifics of the FWAs, you can only hope for
an approximation.
As I understand it, there aren't actually that many manufacturers
of FWA used in paper manufacture (3 or so ??). The FWA characteristics
have a fair degree of similarity, simply because of the underlying physics.
If you want a peak in the blue region, then the absorption wavelengths
have to be pretty much in the same UV region. The visible light emission
spectra can be estimated from an instrument reading. The only likely major
variable, is the efficiency with which UV is turned into blue light,
and that can also be estimated from a spectrum of the paper, if the UV content
of the illuminant is known. Yes, this is only approximate, but approximate
is an improvement on ignoring the effects of FWA, or filtering the UV out.
Graeme Gill.
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