[argyllcms] Re: inter-instrument matching tables
- From: Gerhard Fürnkranz <nospam456@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 17 Nov 2011 21:54:06 +0100
Btw, 15 (+ one for the unprinted paper) is also the number of neugebauer
primaries to be expected for a cmyk print.
-Gerhard
Gerhard Fuernkranz <nospam456@xxxxxx> schrieb:
>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).
--
Best Regards
Gerhard
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