Re: EyeOne Accuracy for FOGRA Proof Verification
Re: EyeOne Accuracy for FOGRA Proof Verification
- Subject: Re: EyeOne Accuracy for FOGRA Proof Verification
- From: Marco Ugolini <email@hidden>
- Date: Wed, 13 Jun 2007 00:44:48 -0700
- Thread-topic: EyeOne Accuracy for FOGRA Proof Verification
In a message dated 6/11/07 5:30 PM, Joseph Yates wrote:
> I'm now seeing this - so how does one account for this in 'ISO Proof
> Verification' workflows - where you are "certifying" that this particular
> proof meets certain FOGRA tolerances - when in fact subsequent readings of
> the same proof with the same instrument may "differ significantly"?
> (Not to say anything about other instruments)
> Or is a deviation of .4 to .5 not that significant for ISO proof
> verification?
I used "significantly" to mean that, taking separate readings of the same
patch, one can detect shifts in Lab values in the order of 0.2 or even 0.5
or so at times, which could combine to produce anywhere between 0.2 and
possibly as high as 0.7 DeltaE CMC of color difference, for example.
Not very much in the big picture, but not negligible either, specially when
one is struggling to compute ISO proof tolerances, where even a small
difference can make or break the results.
Marco Ugolini
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