AW: [ECI-EN] ISOcoated.icc Grey Balance

Please note: Annex C of ISO 12647-2:2004, dealing with grey balance, is *informative* (not normative). Kind Regards Karl Michael Meinecke Bundesverband Druck und Medien e.V. (bvdm) German Printing and Media Industries Federation (bvdm) Biebricher Allee 79 | D-65187 Wiesbaden Postfach 18 69 | D-65008 Wiesbaden Fon +49(0)611 - 80 31 68 | Fax +49(0)611 - 80 32 68 mailto:km@bvdm-online.de | URL www.bvdm.org ------------------------------------------------------ ATS | Altona Test Suite Application Kit www.altonatestsuite.com DPF | Digitalproof-Forum 2005 Stuttgart www.digitalproof-forum.de MSD | MedienStandard Druck 2004 www.bvdm.org/Aktuelles/Downloads.php bvdm-Publikationen recherchieren und bestellen http://www.point-online.de -----Ursprüngliche Nachricht----- Von: Abe Hayhurst [mailto:abe@wedographics.com] Gesendet: Dienstag, 22. März 2005 21:52 An: eci-en(a)lists.transmedia.de Betreff: [ECI-EN] ISOcoated.icc Grey Balance I have downloaded the new ISO profiles that are supposed to conform to ISO 12647-2:2004. In annex C of ISO 12647-2:2004, it lists "CMYK values for use in grey balance patches" as the following values: Quarter tone Cyan 25 Magenta 19 Yellow 19 Mid-tone Cyan 50 Magenta 40 Yellow 40 Three Quarter tone Cyan 75 Magenta 64 Yellow 64 If you lookup the LAB values of these percentages using either absolute or relative colorimetric rendering intent, you will see that the mid-tone and quarter tone have negative A* values and near zero B* values whereas the paper and has a near zero positive A* value and a negative B* value. Tints of Black only that have the same Luminance values as the grey balance patches have A* and B* values much more similar to the paper than that of the gray balance patches. These values do not seem correct. Am I understanding this correctly? Thanks, Abe Hayhurst We Do Graphics, Inc. 1150 N. Main St. Orange, CA 92867 714-997-7390 abe(a)wedographics.com _______________________________________________ ECI-EN mailing list ECI-EN(a)lists.transmedia.de http://lists.transmedia.de/mailman/listinfo/eci-en