Re: Optical Brighters while using UV Filter
Re: Optical Brighters while using UV Filter
- Subject: Re: Optical Brighters while using UV Filter
- From: Graeme Gill <email@hidden>
- Date: Fri, 23 Jul 2004 14:56:48 +1000
- Organization: Color Technology Solutions
Cedric Briscoe wrote:
Roger, is your ICCOLOR and/or Eye-One UV-Fitted? I thought that if the
DEVICE itself were UV-Fitted, then it (the device) would filter out any UV
Brighteners BEFORE the measurements even got to the software. Thus making
the UV check box in PM unnecessary. And for those that were NOT using a UV
Filter, they had the option of correcting in software by using the check
box.
Don't assume that a UV filter and UV correction in software are the same
thing. They are not.
Measuring with a UV filter fitted instrument means making the measurement
of the samples without UV stimulation of any fluorescent response in the
samples. If you are doing this, then you'd better make sure that your
actual viewing conditions for that medium don't have any UV in the illuminant
either !
By using an instrument that does have some UV in its illuminant, and taking spectral
reflectance readings, then you are at least giving the measurement software the
chance to account properly for the UV response in your actual viewing conditions
(and actual viewing condition often will have some UV component in them).
Not all measurement/profiling software can do this, and not all do it well,
but at least they have the chance. This can be far more accurate and flexible
than using an instrument UV filter.
[Using a UV filter in the instrument has been describe as the "stick your
fingers in your ears, close your eyes and go "na-na-na-na" approach"
to dealing with fluorescence.]
Graeme Gill.
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