[argyllcms] Re: inter-instrument matching tables

Am 16.11.2011 15:07, schrieb Alexey Gribunin:

By the way, as I understand, number of principal components should be equal or 
less than 36, i.e. maximum spectral bands. Is this correct?


Yes.


Why did you use 15?


I have selected this value empirically for my data set. The reflectance spectra 
of all the 1786 patches in my data set (which was btw. from an inkjet print, 
measured with Spectrolino) can be represented as linear combinations of 15 
basis vectors with an error of less than 0.01 dE average, and 0.1 dE max, which 
is good enough and certainly below the repeatability of the measurements. Thus 
more than 15 PCs would just fit more of the noise in the measurements, and not 
really improving anything (likely I should have used even less than 15 for this 
data set).

Regards,
Gerhard

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