Re: Finding CIELab Values from Target Chart TIF
Re: Finding CIELab Values from Target Chart TIF
- Subject: Re: Finding CIELab Values from Target Chart TIF
- From: Joseph Yates <email@hidden>
- Date: Fri, 30 Apr 2010 13:15:48 -1000
- Thread-topic: Finding CIELab Values from Target Chart TIF
on 4/30/10 1:25 AM, Roger Breton wrote:
>> But it seems to me - evaluation or comparison of these 2 sets of Lab
>> values
>> - pre-calibration and post-calibration - only shows the color difference
>> between the 2 states - and not how close or far away it brings the device
>> into conformance with - it's repeatable linearized state.
>> Joseph
>
> That's exactly what happens. And that's the great weakness of all those
> systems, IMO, who only take a system from "no behaviour" to "some behavior",
> but that behaviour isn't defined apriori, it is "adapted" or "derived" from
> whatever conditions are found in the device. In a nutshell, today's
> linearization will not equal tomorrow's linearization or linearization at
> any future time. All these systems do is to distribute tone values between
> two extremes according to a power law or some other math function, using max
> channels saturation density and paper. The alternative, as some of the
> better RIPs have it, like GMG's and ORIS's, is to bring back the printer in
> an invariable colorimetric state after each "linearization". Now that's very
> different from mere tone value "placement" which is the extent of
> PhaserMatch and many dedicated, standalone packages like Onyx and a few
> others. Nothing you can do about that. But it's better than nothing, right?
>
> I feel your pain.
>
> Best / Roger
It IS certainly better than nothing! ;-)
We use the ORIS RIP for our inkjets - so I know what of what you are
referring to here...
So any suggestions - how one might evaluate (verify) that the PhaserMatch is
- at the very least - putting the device into a repeatable state or
"behavior"?
Joseph
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