Re: Editing profiles [was New EyeOne ruler and soft case]
Re: Editing profiles [was New EyeOne ruler and soft case]
- Subject: Re: Editing profiles [was New EyeOne ruler and soft case]
- From: Roberto Michelena <email@hidden>
- Date: Fri, 4 Nov 2005 08:44:13 -0500
I think there's one very important reason while iteration works better
in some cases (GMG, Oris) than in others (PrintOpen, EFI's SCO tool):
the space in which it's done.
The very big problem with ICC device profiles and standard CMMs come
in the gamut boundaries.
While there was original data of the boundaries (from the target
readings), and it still is in the Device->PCS table, there is no trace
of that data in the PCS->Device part.
As the PCS->Device table defines the grid in PCS (Lab) coordinates,
the gamut boundary will fall not on gridpoints, but instead on
interpolated space. Given that the interpolation algorithms are
generic and not tuned to the behaviour of the individual device, it's
quite likely that the larger dE errors will fall in the gamut
boundaries of the device.
And iteration will help, but it's akin to trying to position a screw
in place by holding it with a pair of three feet long tweezers. And
furthermore, those tweezers are magnetized to that they will disturb
the neighbouring screws.
It'd be much easier and precise if you just held the screw between
your fingers, isn't it? that's precisely what you get when you iterate
in the LINK, and that is what GMG and Oris (and Dupont, and I believe
also ColorGate) do.
-- Roberto Michelena
Infinitek
Lima, Peru
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