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: Wed, 1 Dec 2004 10:53:12 -0500
- Importance: Normal
Title: Message
<Nice piece of work. My only comments are
three:
<1) The non-iterative result is surprisingly poor. Using my usual non-iterative
tools I'd expect to get a result much closer to the GMG iterative result
than their non-iterative one with an ECI2002 source chart, and (Say) 3000
test patches on the inkjet.>
I agree that the initial calculation was not so great. After the first iteration however, the delta E falls significantly (ave delta E 2.6, max 9.2) and gets better with each cycle.
<2) The number of test patches isn't apples to apples. The iterative approach
used several times the number of patches to characterize the inkjet.>
Being iterative, it did use more measurements, but the the charts (patch count) were the same. Are you saying that if the ECI is measured say 4 times that in order to be apples to apples, I should use 1485 x 4 patches for the non-iterative approach? If that's the case, I wouldn't be able to test this as GMG only supports certain targets (ECI, IT8, TC4). Not only that, but after the first iteration, values that are below the target delta E are not re-measured, so the number of patches measured is less with each iteration and one would have to keep track of the actual number of patches measured for each iteration in order to determine the size of the chart the non-iterative approach needs (and since the iterative profile is based on the non-iterative profile, there's a chicken-or-the-egg thing going on). One would also then wonder if better results could be obtained by iterating the larger chart.
I suppose there still is an open question as to whether results as good could be obtained with a larger initial test chart. The point of the test however, was to satisfy my curiosity that colors outside the ECI patches were being competently adjusted and that there was more going on than simply benchmark trickery. I think the test shows this.
<3) The GMG result is very respectable, and certainly as good if not better
that other approaches I'm familiar with.>
no argument there...thanks for the feedback
mike
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