[argyllcms] Re: Spectral illuminant sample

  • From: "Marco N." <manold@xxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 16 Feb 2008 20:52:49 +0100

I have already tried yesterday to change the number in a .sp file that were near to the txt GMB file but without success.

The only solution is to wait the conversion utility

In the CXF, make sure that the light is normalized at 560nm or
560nm = 100.00

I don't understood this words. In the txt file there is no reference at all.

Marco



Il giorno 16/feb/08, alle ore 20:36, Roger Breton ha scritto:

Marco,

So getting back to your orginal question, I don't know of any utility or procedure that will give you what you want but you can do the conversion manually. In the CXF, make sure that the light is normalized at 560nm or 560nm = 100.00. If that's the case, if I were you, not knowing more about
any Argyll's utility that Graeme may have already written to do this
conversion, I would start from, say, D50_0.0.sp and change the values you
need to change to work with your particular custom light source.

I don't think this is more difficult than that?

I copy and paste from the documentation: "Spectral illuminant
description. This is an ASCII text, CGATS, Argyll specific format,
used to hold a spectral description of an illuminant. Typically it is
used to record a custom illuminant, for use in computing Fluorescent
Whitening Agent compensation for reflective samples, as well as
computing CIE tristimulus values from spectral samples."

I want find the Lab value starting from both spectral data of patches
and of light.

Marco


Il giorno 16/feb/08, alle ore 19:45, Roger Breton ha scritto:

What's an .sp file?

In what way can I convert a Gretagmacbeth spectral light sample (cxf
or txt format) in a .sp file?

Thank you
Marco


Roger Breton






Roger Breton





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