Re: Yellow too high on GRACoL 7
Re: Yellow too high on GRACoL 7
- Subject: Re: Yellow too high on GRACoL 7
- From: Roger Breton <email@hidden>
- Date: Thu, 06 Apr 2006 20:55:00 -0400
Jim,
I listened in on the Gracol webinar this afternoon and was apalled (I think
that's the right word) by the lack of guidelines relative to optical
brighteners in the G7. Imagine, all the presenter was able to relate during
the 1 hour and a half presentation was "a paper with no optical brightners
is required to implement the G7 methodology". I mean, is that it? The ISO
Lab coordinates suggested for the #1 "Gracol-compliant" paper, a* = 0 (+-
0.5) and b* = -2 (+- 1.0); that's not where the bulk of commercial printing
takes place in the US (and abroad). So, instead of loosely requiring that
the substrate be as free of OB, why not use some quantitative guidelines to
describe OB? Everything is presented as so "mathematical" and so
"scientific" in everything being done around Gracol, that, the fact that no
scientific or mathematical way of assessing the level of OB present in a
Gracol-candidate paper grade sounds like, well, inconsistent.
> Your comments are pragmatic, but technically, using paper with a load of
> brighteners and a spectro with a uv filter means you are outside of the G7
> specifications.
See? That's what bugs me. Unless this Gracol "club" is going to become an
"elite" kind of club, filled with only those printers that have the
resources to print on OB-free paper, this kind of loosely-defined
requirement is going to turn off a lot of folks. Why not coordinate efforts
with other standardization groups to come up with some kind of quantitative
"tolerance" for OB, like a DeltaE range, really, instead of leaving it up to
anyone's interpretation?
> Jim Rich
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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