Hi, Kai-Uwe is right, ICC absolute intent does not account for intensity, that would be the CIE-absolute. There is a tag for obtaining such values, but lcms does not support that (nor any other CMM I'm aware of)
Regards Marti Quoting Kai-Uwe Behrmann <[EMAIL PROTECTED]>: > Am 08.12.07, 18:36 -0600 schrieb Michael A. Litscher: > >> The short version: >> >> The issue I am having is that if I display an RGB value on the screen >> and measure it's Lab value, I should be able to feed that Lab value into >> LCMS, along with the monitor's profile, and get the original RGB value, >> or something very close to it visually. However, the RGB value I get >> back from LCMS is off, significantly, and lighter in almost every case. > > Does you proper scaling for luminance (lumi tag ~CIE*L 116)? > >> The input profile I'm using is the built-in Lab4 profile. The output >> profile I'm using is created from the monitor's profile file. The >> transform I am doing is from Lab double to RGB 8, Absolute Colorimetrix >> Intent, with a No Precalc flag. > > Seems ok. > The profile looks internally ok. ICC Examin reports a DE of ~1.3. > > The spreadsheet shows not too much, as it has only results not the math. > > > regards > Kai-Uwe Behrmann > -- > developing for colour management > www.behrmann.name + www.oyranos.org > > > ------------------------------------------------------------------------- > SF.Net email is sponsored by: > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://sourceforge.net/services/buy/index.php > _______________________________________________ > Lcms-user mailing list > Lcms-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/lcms-user > ------------------------------------------------------------------------- SF.Net email is sponsored by: Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
