Re: D65 vs D50 reflection and transparency viewers
Re: D65 vs D50 reflection and transparency viewers
- Subject: Re: D65 vs D50 reflection and transparency viewers
- From: Roger Breton <email@hidden>
- Date: Sat, 27 May 2006 14:52:39 -0400
> Simply put, I'd like to know which viewers I'm supposed to
> choose for prepress work here in Italy.
>
> I would also be grateful for any link on this subject.
>
> Thank you very much in advance.
>
> giordano
Since you are in Europe, why not investigate JUST-Normlicht products?
Incidently, speaking of viewers for graphic arts, has anyone found that the
GTI booths and the GTI fluorescent lamps never hit the 5000K mark when
measured (EyeOnePro and BabelColor in ambiant mode)? I'd be wiling to
compare notes with anyone on this List as I have personally measured many,
many such GTI booths over the last 16 months or so, at printers sites and
"institutions" like GATF, and I must say that I have never gotten better
than 4650k to 4800K out GTIs -- tops. Close to 5000K, granted, but never
quite the 5000K CIE u' v' chromatiticies called for in the ISO-3664:200x
standard, and, according to my measurement, almost always on the border of
the 0.005 tolerance CCT radius, if not flat outside. Which baffles me.
Arguably, it's possible many of those printers and sites all happened to
have worn out lamps the day I made my measurements. That would undoubdetly
affect the results, I don't debate it. But as you know, many printers on
this side of the pond stick with GTI lamps while many in Europe, Asia and
the rest of the world stick with JUST-Normlicht lamps. Yet, many printers
who operate newer Heidelberg presses (Goss Sunday 4000, Speedmasters), which
all come equipped with their very own luminaires, use a third kind of 5000K
fluorescents, made by Phillips B.V. As it turns out, I never heard anyone
questioned the legitimaty of those Phillips lamps. No the pressmen, nor the
clients. People are just happy or unhappy about the matches. And you should
see the ranges of the proofs that make their to modern press rooms -- it's
laughable some times. Anyway, contrast this with the prevailing attitude in
the industry that, when considering the addition or replacement of a press
luminaire, only GTIs lamps should qualify. The argument goes that since many
design studios and agencies have GTI booths for color viewing to begin with,
so should the printer to maximize the chances of color matching on press. It
makes sense in a way but why do the GTI systematically never measure the
5000K published chromaticities whereas the JUST always do? At least in
measurements. That's why I'd like to hear other people's comments and
compare notes.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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