Re: Real world experience w/ GMG and Oris RIPs
Re: Real world experience w/ GMG and Oris RIPs
- Subject: Re: Real world experience w/ GMG and Oris RIPs
- From: Mike Eddington <email@hidden>
- Date: Sat, 27 Nov 2004 12:39:07 -0500 (EST)
- Organization: North American Color, Inc.
<That interpolation is the one subject to error; because it's based on an
assumption (or model) which can be not totally accurate.>
Thanks to all for the very informative posts.
So, in GMG's case, would it not be fair to say that the the initial interpolation to determine optimum CMYK for the proofer may not be accurate enough? After all, the underlying model is an assumption, and the proofer could be (likely is) using a different paper that changes quite a bit about which CMYK results in which Lab. Wouldn't it then be fair to say that to compensate for this, a few iterations might be able to improve the interpolation?
I suppose the use of the test chart could in fact create an artificially good impression of how much real improvement is gained in other colors, but surely the process would in fact improve areas outside of the test chart to some degree and therefore have an advantage over a non-iterative approach. This sounds less like a benchmark trick.
<The IPA proofing report was interesting, and perhaps can be inferred to indicate
that GMG produced an very good technical result, but little more than that given that
the same chart was used for profiling and verification.>
Perhaps more could could be gleaned by verifying with a different chart than was used for creating the profile, but that would require two test charts from the original press run that resulted in the DTR004 data, both averaged from the same press sheets that resulted in the data. Since this didn't happen, it wouldn't be much use to use a different test chart for verification at this point because there is nothing to guage whether or not the different chart would be accurate to DTR004. This could still be tested by either performing another press run or using another target device (like a Kodak Approval) to print out both test charts and start from there, but this wouldn't give accurate information on how close the proof is to the existing DTR004 data.
mike
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