Re: Accuracy of Instruments
Re: Accuracy of Instruments
- Subject: Re: Accuracy of Instruments
- From: "Mike Eddington" <email@hidden>
- Date: Fri, 2 Nov 2007 15:59:13 -0400
- Thread-topic: Re: Accuracy of Instruments
>If there are, say, identical proofers in different locales profiled
and/or linearized by two different instruments and are each tasked with
matching a common reference, well, that sounds like one of the few
possible examples. But then one has to ask, will those proofs ever be
placed side by side, looked at by the same observe, an how "identical"
do they need to be? When will this happen in practice?>
Its actually quite common. How about a remote proofing scenario? We've
got 8 or 9 proofers at remote sites and 4 more internal proofers that
all have to match a common reference. Or how about a service bureau
providing proofs to third party printers who then compare it to their
own internal proofing system (again, happens here all the time). Proof
to proof comparisons are done quite often.
>and how do these variances stack up against the difference between,
say, the two DTP70s used to linearize the printers?
But if the inter-instrument agreement between those two DTP-70s is an
average dE of 0.96 (on indentical makes and models), then at best,
you'll always be that far off, unless varability favors you for a
moment, so add that on to the eveything else. My point is, there should
be at least one solid foundation in all this variability, and
spectrophotometry stands the best chance at this.
Mike
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