Re: GRACoL & SWOP Tolernaces
Re: GRACoL & SWOP Tolernaces
- Subject: Re: GRACoL & SWOP Tolernaces
- From: Jim Sewell <email@hidden>
- Date: Thu, 24 Apr 2008 21:06:35 -0400
- Thread-topic: GRACoL & SWOP Tolernaces
Todd
Everyone was in Chicago at the IPA Technical Conference which ended today.
I'm sure there will be some answers now that it's over. I have seen the
tolerances for manufacturers to get certified, as well as a footnote that
real world tolerance were expected to be looser.
Jim
On 4/24/08 3:35 PM, "Todd Shirley" <email@hidden> wrote:
> 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 ³to the numbers² 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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