Re: MonacoPROFILER and UV
Re: MonacoPROFILER and UV
- Subject: Re: MonacoPROFILER and UV
- From: Roger Breton <email@hidden>
- Date: Mon, 11 Sep 2006 21:03:53 -0400
I wrote:
>> In practice, say we measure a paper that has a b* of -4 with an instrument
>> not fitted with a UV filter, that same paper, all of a sudden, will measure
>> a b* of -1 or close to 0 when measured with UV filtration.
>>
>> Which is right? Or true?
To which Graeme Gill replied:
> Whichever best matches the intended viewing environment.
Please forgive my ignorance but it does not seem to know a priori the
characteristics of the viewing environment under which the proof will be
viewed?
Graeme Gill also wrote the following:
> The software has to be told how much UV to assume in the viewing
> environment to have a hope of calculating things accurately. One
> of the current difficulties is that there are no easily accessible
> instruments for measuring the UV output of illuminants. Common
> graphic arts instruments stop about 400nm or so, and they need
> to go down to about 360nm to be useful for measuring UV
What could be done, today, with spectral irradiance data down to 360nm or
even 300nm? Say, using an OceanOptics type of spectrometer.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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