Re: Camera profiling with ICC et al
Re: Camera profiling with ICC et al
- Subject: Re: Camera profiling with ICC et al
- From: email@hidden
- Date: Mon, 15 Sep 2008 13:55:36 EDT
In a message dated 9/15/08 9:48:45 AM, email@hidden writes:
> I found a very high correlation
> between the metrologically best profiles and the ones that produced
> the most realistic (not necessarily most pleasing) image variants.
>
Yes, that can well be true when all the errors are relatively large, or in
any one or small number of instances where the capture happened to minimize
metameric problems, but can fail when subjected to comprehensive rigorous
double-blind psychophysical testing when only the natural subject matter is included.
If you have any doubt, decide that you want to make the most realistic
reproduction of the human subject in your test. You then telespectroradiometrically
measure many samples of the subject, and build a profile heavilly weighted by
this data. The resulting profile does a superb job on the subject but performs
poorly on the test target. Then you build additional profiles replacing
subject samples with chart samples. Reproduction of the chart improves while
reproduction of the subject worsens. Of course this is an extreme example, but many
have performed similar more practical excercises. This is the whole principle
of optimization for which there is a very large body of work in the technical
literature.
Eric Walowit
Tahoe
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