GRACoL & SWOP Tolernaces
GRACoL & SWOP Tolernaces
- Subject: GRACoL & SWOP Tolernaces
- From: Todd Shirley <email@hidden>
- Date: Thu, 24 Apr 2008 16:35:00 -0400
Hello List
Two days ago in another thread I said, "I am beginning to think I am
going crazy, because I cannot find published tolerances for GRACoL or
SWOP anywhere. I must be crazy, right? In "IDEAlliance 2007
Specifications and Guidelines" there are SWOP & GRACoL Print
Characterization charts which state "DEab of 5 or less for all colors"
but that is all I have ever been able to find. What about paper color,
average DE, Max DE, etc.? Anybody know where this info is published?"
In two days nobody has answered this question. Come on! How can it be
that not a single member of the entire colorsync users list knows
where to find the tolerances for GRACoL & SWOP?? This is insane. There
are lots of CM consultants on this list who talk about how close the
can get to these specs, and yet NOBODY knows what the official
tolerances are? Doesn't that mean that anybody can claim that ANY
proof is GRACoL or SWOP compliant? Doesn't that render the specs
useless? Am I living in an alternate universe?
From http://www.idealliance.org/swop/certification/
"... proofs are now measured and judged “to the numbers” of the
characterization datasets developed from press runs. The new program
was launched in the fall of 2006 and today over 60 hard copy systems
have been certified to the tight tolerance of an average 1.5 dE."
OK, so the tolerance to be SWOP or GRACoL certified is average 1.5 dE.
Is that it? What about Max dE? Primaries? ISO 12647-7 lists 6 metrics,
and we have one, buried on the bottom of a webpage? Not exactly
"published".
If you start digging around in the application data sheets for each
proofing system [ http://www.swop.org/certification/systemlist.asp ],
it appears that the tolerances are:
Paper: max dE(ab) 3
primaries: max dE(ab) 5
secondaries: max dE(ab) 6
3 color 50%: max dE(ab) 3
Again, this is not exactly "published", but it is public. Are these
the "official" tolerances from Idealliance and SWOP & GRACoL? Why are
they so hard to find?
–––
Todd Shirley
Urban Studio
New York, NY _______________________________________________
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