Re: DTP41UV/T or DTP41/T - which to choose??
Re: DTP41UV/T or DTP41/T - which to choose??
- Subject: Re: DTP41UV/T or DTP41/T - which to choose??
- From: Graeme Gill <email@hidden>
- Date: Fri, 11 Oct 2002 11:33:13 +1000
Marcelo Copetti wrote:
>
At first, if you have or will have papers with whiteners, you need an
>
UV filter.
Not necessarily true.
>
There is no disatvantages to use UV filter. The function of this filter
>
is cut of invisible lights.
If you've measured the samples with all the UV filtered out, and
then view them in a situation where there is UV present, there will
certainly be a disadvantage - you'll get poor results.
>
In case of papers (or other materials) with whiteners, invisible light
>
is converted to visible light, and spectrophometers read as blue,
and human beings read as blue too under that illuminant (colorimeters
measure visible light just like the human eye)
>
and software usually try to avoid this problem with more yellow, than you
>
have a profile that produces a bad proof.
Only if you view it in lighting that has a different UV content
to what the spectro is using.
>
In papers that has no whiteners, we have no differences in response to
>
spectrophotometer light.
To put it another way, if the sample has no fluorescence, then the
amount of UV in the illuminant (spectro or viewing) has no influence
on the results.
Graeme Gill.
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