[argyllcms] Re: Determining proper error value for -r

Ben Goren wrote: 
Well, that's why I used ``may''  instead of ``will,'' and ``not so
low as to have real trouble with noise.


OK, sorry haven't read carefully enough.

What I'm driving at is that, within the range of values for -r which are at least large enough to be an accurate reflection of the error bands of the data, the lowest value should, I think, if I'm understanding it right, produce the most accurate colors. It's also the value most likely to bump into non-linear properties of the printer. At the other extreme, a value that's ridiculously high will produce results more akin to not even profiling the printer in the first place.

Yes, when the smoothing factor increases towards infinity, smothing splines asymptotically degrade to a multiple linear regression. The model is then strongly biased and can describe e.g. CMYK->Lab device characteristics only with a large error.

Regards,
Gerhard


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