Re: On the effect of florescence
Re: On the effect of florescence
- Subject: Re: On the effect of florescence
- From: John Wickham <email@hidden>
- Date: Tue, 01 Mar 2005 10:19:21 -0800
On Monday 1, March, 2005, Robin Myers wrote:
> I test the printer paper before making any target measurements. If an
> FWA is present, I use a UV Cut filtered instrument. Although it is
> possible for software to guess that an FWA is present and remove some
> of the effects from the measurements, it is also possible for the
> software to misdiagnose certain colors (e.g. blue-grays) and apply
> correction where none is needed, producing a wrong result. Using a UV
> Cut filter removes these ambiguous situations from the measurements,
> making the software work better.
Robin, are you saying, if there is no FWA present leaving the UV Cut filter
on could cause an unreliable reading?
> I do not believe there is any ASTM standard on this since the type and
> amount of UV blocking filtration would depend on the instrument's light
> source (e.g. tungsten-halogen, xenon flash tube).
I have been under the assumption that xenon flash, because of it's color
temperature? did not need a UV Cut filter. Could you comment on this?
Thank You, for your time Robin
John Wickham
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