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
