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: Graeme Gill <email@hidden>
- Date: Sun, 28 Nov 2004 23:01:23 +1100
- Organization: Color Technology Solutions Pty. Ltd.
Roger Breton wrote:
Right. So all profiling packages that report 'DeltaE of 0.73" after
calaculating B2A table should be taken with a grain of salt?
Depends exactly what they are reporting. It would be usual for
a package to report on the fit between the test chart values and
the colorimetric A2B table. One would expect this to be good if
the device behaves in a consistent way, if the model being fitted
is appropriate, and if the fitting is good.
If this fit is poor, it's often a hint that something's gone wrong
(for instance loosing track of corresponding device values and CIE
value patches).
I'm not sure if any/many packages report on the accuracy of their
inversion (B2A table accuracy). Such a report is complicated by
trying to test only in-gamut colors, and the "smooth off" at the
edges of the gamut, where the finite resolution of the PCS grid straddles
the edge of the device gamut, leading to larger errors in colors that
strictly should be in-gamut.
Graeme Gill.
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