[Lcms-user] Clarification about chromatic adaptation

[Andrea G. <and...@ma...>]

Hi to all,
I realized an esperiment coping a standard profile and changing the 
chromatic adaptation matrix from identity to a
Bradford D65->D50 one. I saved a D65 Lab profile using the code:

cmsHPROFILE                 hProfile   = cmsCreateLab2Profile( 
&D65illuminant );
cmsSaveProfileToFile( hProfile, "LabD65.icc" );

Than I created a very simple CGATS with base pure CMYK tints and I used 
transicc to translate
CMYK to Lab using this commands

transicc -iSNAP2007_D50.icc -o*Lab2 -t3 CMYK.txt CMYK_D50.txt

and

transicc -iSNAP2007_D65.icc -oLabD65.icc -t3 CMYK.txt CMYK_D65.txt

I expected different results from D50 and D65, similar to measures obtained
measuring the printed patches under the different illuminants, but
transicc produced almost identical results (Max DE00 0.0015).

Did I do somethink wrong?

Thanks
Andrea

-- 

Andrea Galligani

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