>It's probably not easy to associate them unambiguously with exac L*a*b* >values, since e.g. one particular Pantone ink may show up with slightly >different colors on different paper brands. And the rendering intent >plays a role as well. It may be necessary to supply different L*a*b* >values in the PCS for different rendering intents (e.g. relative >colorimetric vs. perceptul) in order that the actually printed color >will be the same.
This is one of the rare cases the intent should be absolute colorimetric. The spot color is formed by combination of inks *plus* substrate. I cut the media with scissors to remove the unprinted paper to do a side-by-side match. The appearance of paper (with often a yellow cast) does confuse a lot the observer . Regards, Marti. ----- Original Message ----- From: "Gerhard Fuernkranz" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, July 08, 2004 8:40 PM Subject: Re: [Lcms-user] Understanding RGB->CMYK with specific Pantones Marti Maria schrieb: >Hi, > >I assume you want the simplest way, and really don't worry about exact precision. >This is not an issue here, since pantone certification does NOT always tie colors >names with exact Lab values. > It's probably not easy to associate them unambiguously with exac L*a*b* values, since e.g. one particular Pantone ink may show up with slightly different colors on different paper brands. And the rendering intent plays a role as well. It may be necessary to supply different L*a*b* values in the PCS for different rendering intents (e.g. relative colorimetric vs. perceptul) in order that the actually printed color will be the same. Regards, Gerhard ------------------------------------------------------- This SF.Net email sponsored by Black Hat Briefings & Training. Attend Black Hat Briefings & Training, Las Vegas July 24-29 - digital self defense, top technical experts, no vendor pitches, unmatched networking opportunities. Visit www.blackhat.com _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user ------------------------------------------------------- This SF.Net email sponsored by Black Hat Briefings & Training. Attend Black Hat Briefings & Training, Las Vegas July 24-29 - digital self defense, top technical experts, no vendor pitches, unmatched networking opportunities. Visit www.blackhat.com _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
