Re: [ECI-EN] [pab] Profile for Heatset Woodfree Uncoated SC

Hello all together, I´m currently discussing with a paper manufacturer recommendations for FOGRA char-data / ECI-profiles for his papers. For woodfree uncoated papers, it seems clear, that FOGRA 47 / PSO_uncoated_eci.icc should be used. But digging a little bit deeper into paper categorization and printing standards, the situation is not so clear. If we look at the gamut, FOGRA47 /PSO_uncoated is smaller than e.g. FOGRA40 / sc-paper. If we are looking at the the traditional paper categorization for heatset printing, the WFU (Wood free uncoated) papers are representing a higher quality grade than SC papers (both are uncoated materials, but SC-papers have a higher amount of wood fibers than wood free papers...) So far as I learned about traditional paper categorization, the WFU papers can may be super calandered or not. If not, this are the typical uncoated papers, which are used e.g. in sheetfeed offset printing with data preparation according FOGRA47 / PSO_uncoated. If they are super calandered (WFU SC), they are more comparable with the SC-paper category but with a much brighter paperwhite. ***************** L*a*b* 100 K an 100C 100M 100Y for FOGRA 47 and FOGRA40 ***************** Source: MedienStandard Druck 2010 from bvdm FOGRA 47 Black Backing 100 K = L*31 a*1 b*1 100C 100M 100Y = L*32 a*0 b*0 FOGRA 47 White Backing 100 K = L*31 a*1 b*1 100C 100M 100Y = L*33 a*0 b*0 FOGRA 40 Black Backing 100 K = L*22.2 a*0,9 b*2,1 100C 100M 100Y = L*26,2 a*-1,6 b*-3 FOGRA 40 White Backing 100 K = L*22.4 a*1,1 b*2,3 100C 100M 100Y = L*26,6 a*-1,5 b*-2,8 The comparison of this values, shows, that the densities / amount of color for FOGRA 47 (uncoated) is much lower than for FOGRA40 (SC-paper). Especially for WFU SC, this leads to following question: - If ISO 12647-2 papertype 4 is used as standardization target and FOGRA 47 / PSO_uncoated for data preparation, we have a quite small gamut compared to FOGRA 40 / SCpaper. On the other hand FOGRA 40 / SCpaper could not used as target, because the whitepoint of WFU SC is very different to FOGRA 40 / SCpaper. A better candidate for gamut and paperwhite could be theoretically FOGRA41 / PSO_MFC. But technically , this profile represents another paper category. Another possibility would be, that the paper manufacturer adapts the available standardization targets, publishes target values for white and black backing and makes characterization-data and an ICC-profile public available. For PDF/X workflows the characterization-data would be registered at http://www.color.org I would be interested to hear what other people are thinking about this issue Best regards Jan-Peter -- ---------- Please note the new adress -------------- homann colormanagement --------- fon +49 30 611 075 18 Jan-Peter Homann ------------ mobile +49 171 54 70 358 Cotheniusstr. 3 -------- http://www.colormanagement.de 10407 Berlin -------- mailto:homann@colormanagement.de _______________________________________________ pab mailing list pab(a)lists.callassoftware.com http://lists.callassoftware.com/mailman/listinfo/pab