Hi, Gamut warning is just an approximation. ICC has a specific tag for doing that, but unfortunately, most profiles doesn't have such tag or worst, the information inside the tag is plainly wrong. So, lcms is computing the gamut "on fly" using the rel.colorimetric tables. This works fine for some profiles, and fails miserably for others. lcms algorithm is sophisticated enough to let some movement in order to infer the correct gamut but if the profile has some kind of gamut remapping embedded in the rel. colorimetric intent (which shouldn't) the method doesn't work.
So, gamut check would be useful to check spot colors and to give a coarse idea on which zones will be for sure out of gamut, but not so precise in the gamut boundaries. Some similar to what Adobe's Photoshop is doing. But again, note that this is due to profiles, and not to Photoshop or lcms code. Regards, Marti Maria The little cms project http://www.littlecms.com [EMAIL PROTECTED] ----- Original Message ----- From: "T E Schmitz" <[EMAIL PROTECTED]> To: "lms mailing list" <[EMAIL PROTECTED]>; "Marti Maria" <[EMAIL PROTECTED]> Sent: Sunday, February 22, 2004 10:31 AM Subject: [Lcms-user] Gamut Warning Hello Marti, How reliable is the gamut warning? Is it based on the same algorithm as the actual conversion? I am using the gamut warning to make a decision as to which scanner profile to choose. There certainly seems to be a correlation between the extent of gamut warning and, after the conversion, the clipping visible in the histograms. -- Regards, Tarlika Elisabeth Schmitz ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
