RE: Commercial Printers and Color Management
RE: Commercial Printers and Color Management
- Subject: RE: Commercial Printers and Color Management
- From: Ray Maxwell <email@hidden>
- Date: Wed, 8 Oct 2003 10:51:34 -0700
Ray:> When you submit a system for SWOP approval you are compared
against the most
>
> recent SWOP approved press run.
>
Roger: I hate to ask but what form does the "most recent SWOP
approved test run"
>
takes? I don't suppose that this is that part of the SWOP Analog or
>
Digital
>
Calibration Kit?
>
Ray:> TR001 contains the colormeteric data from a press run done in
1993. There
>
> have been many runs since and they differ from TR001.
>
Roger: Anyone of those runs documented?
Ray Replies:
I have been told that they are TR002 and TR003. This is why the GRACOL test
run is TR004.
>
Ray: > It is my understanding that TR001 is not the aiming point for
SWOP approval.
>
> The current approved press run is the aiming point
>
Roger: At the bottom of page 40, 9th Edition, it is stated that:
"Data
>
characterizing the nominal center point of the population of Certified
>
Press
>
Proofs can be found in ANSI/TR001." The paragraph right above starts with
>
"SWOP proofing systems can be calibrated by use of the SWOP Calibration
>
Kit
>
(analog) or the SWOP Digital Calibration Kit." I ask you: what calibration
>
can they be talking about if not the color of the proof itself? To me,
>
this
>
is crystal clear: TR001 is the "nominal center point" of SWOP Certified
>
Press Proofs. How many ways can it be interpreted otherwise?
>
Ray Replies:
TR001 is the nominal aiming point, however, no measurements are made at the
time of certification. The sheets that the visual comparison is made
against are not exactly TR001.
>
Ray: > I would welcome an objective colormeteric aiming point for
SWOP. It is my
>
> understanding that we are not there yet.
>
Roger: So you're saying that TR001 has been rendered "obsolete" by
virtue of all
>
those press runs that have taken place since 1993?
>
Ray Replies:
I would not use the word "obsolete". However, the press runs are not the
same. In addition the paper that was used for the 1993 run (Textweb) is no
longer available and SWOP is deciding on a new standard paper.
>
>
> Regardless of how close your colormeteric data may be to TR001, your
>
> approval depends on a subjective panel of three people deciding if your
>
> proof is visually close to the most recent SWOP approved press run. The
>
> decesion is subjective and not releated to making objective measurements
>
and
>
> comparing them to TR001.
>
>
So, in the end, it's visual process you say? There is no objective,
>
scientific, rigorous colorimetric analysis involved in certifying a "SWOP"
>
proofing system? So all the systems listed at
>
http://www.swop.org/certification.html#cert are the results of visual
>
inspection by a subjective panel of three people? They better have their
>
color vision checked by the Munsell/Farnsworth 100 Hue test! Talk about
>
being in the stone age.
>
>
Regards,
>
>
Roger Breton | Laval, Canada | email@hidden
>
http://pages.infinit.net/graxx
>
>
Ray Replies:
Currently, SWOP has not specified an objective tolorancing method by which a
system is certified. This is not an easy task. While SWOP has not agreed
on an objective way to judge the accuracy of a proof, they are ahead of most
of the other standards in the industry. GRACOL has just made there first
attempt to do what SWOP did in 1995. SWOP did attempt to characterized the
1993 SWOP approved press run by taking colormeteric measurements. That data
was published in 1995 as TR001.
The difficulty is specifying an objective tolorancing method that agrees
with the consensus of a visual examination by a group of people.
Traditions in the printing industry change slowly. I applaud the efforts
made by SWOP to get to an objective standard. It is hard to please all of
the people all of the time.
Ray
>
Creo
>
Ray Maxwell | Senior Color Systems Engineer, Inkjet Printing
>
4225 Kincaid Street | Phone (604) 451-2700 ext. 2004
>
Burnaby, B.C.
>
Canada V5G 4P5
>
IMAGINE CREATE BELIEVE
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