Re: Real World Color Management - How to convert spectral data to Lab?
Re: Real World Color Management - How to convert spectral data to Lab?
- Subject: Re: Real World Color Management - How to convert spectral data to Lab?
- From: email@hidden
- Date: Wed, 26 Feb 2003 15:36:46 +0100
on 2/26/03 6:58 AM, Nick Wheeler wrote:
>
> Does anyone know how I could convert that spectral data (for a given
>
> whitepoint) to Lab in order to "close the loop" of the objective
evaluaion
>
> procedure.
>
I'm pretty sure you can do this in GretagMacbeth's (Logo's) ColorLab.
Hello all,
Yes, it's easy. Just open spectral data in ColorLab and then choose
Filter-Conversion-CIE Colors. Then you can select any illumination and
observer you want. Same procedure for density conversion (using different
filters).
The only problem I'm aware of is that recently Measure Tool (v. 4.1.1) is
using different internat format for spectral measurement. Previously it
was like:
BEGIN_DATA_FORMAT
SampleID SampleName nm380 nm390
and so on but now is:
BEGIN_DATA_FORMAT
SampleID SampleName SPECTRAL_NM_380 SPECTRAL_NM_390
and so on.
So simple conversion (replacing "SPECTRAL_NM" with just "nm") in text
editor is necessary before opening measurement file in ColorLab (v. 2.8).
regards
Grzegorz Lucki
RR Donnelley Europe
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