Re: maclife.de
Re: maclife.de
- Subject: Re: maclife.de
- From: "edmund ronald" <email@hidden>
- Date: Mon, 18 Aug 2008 15:10:32 +0200
"Overfitting" is the term used in interpolation theory to signify
rendering an approximant useless by requiring slavish adherence to the
example data.
My impression is that Large Format printers like these overfitted
profiles somehow because they need to hit contract (brand) colors.
Photographers hate them because they aren't smooth. I know nothing
about press.
Edmund
On Mon, Aug 18, 2008 at 2:56 PM, Uli Zappe <email@hidden> wrote:
> Am 16.08.2008 um 03:45 schrieb Graeme Gill:
>> Note that (paradoxically) a profile that has a poorer self fit measure may
>> in fact be a better fit to the underlying device
>> characteristic, because it has smoothed out some of the noise in the
>> measurement values, and conversely, a profile that has
>> a very low self fit error may be a worse match to the underlying device,
>> since it is slavishly following noise in the measurement set, and may not be
>> applying a reasonable model in between these points to generate the
>> interpolated values.
>
> Yes, this is a well known phenomenon not only from scanner profiling
> (especially printers come to mind). Profiles with a tight delta E fit may
> look quite ugly when applied to a Granger rainbow, for instance, because
> smoothness was sacrificed to curve fitting.
> Bye
> Uli
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