New information on ECI-ICC profiles for Offset Printing for improved print quality

Posted: October 20, 2012 in cie lab, Color, Color Management, ECI, ICC, ICC profile, ICC Profile Version 4
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In the light of the established collaboration between the European Color Initiative (ECI), Fogra and the German Printing and Media Industries Federation (bvdm), the Fogra characterization database has been extended to three newly developed sets of characterization data.

While FOGRA48 addresses heat set printing on improved newsprint stock FOGRA49 and FOGRA50 cover standardized offset printing based on FOGRA39 with additional surface finishing namely matt and glossy laminated sheet-fed offset prints using OPP films.

The new printing condition FOGRA48 and the associated ICC profile “PSO INP Paper (ECI)” for heatset web offset printing on improved newsprint are based on a test print series conducted by the ECI web offset working group (WOWG). Several European web offset printers contributed print samples on typical improved newsprint papers. Upfront the working group had agreed upon aim values for the solid coloration and the tone value increase  (TVI) of the printing inks cyan, magenta, yellow and black. As for all other offset profiles provided by the ECI, the aim values for the TVI are taken from the international standard ISO 12647-2:2004. For the dot gain of cyan, magenta and yellow curve C (19%) applies, and curve D (22%) for black, measured in a 40% patch of a control strip. With the new profile the ECI completes the range of standard profiles for web offset papers.

The characterization data for lamination are based on test prints of the ECI coating working group, which included several types of coated paper and cardboard, as well as different lamination films and machines. Based on measurements before and after lamination, typical colour changes have been determined and applied to the FOGRA39 data set. This ensures an optimal correspondence between unlaminated and matte (FOGRA49) or glossy (FOGRA50) laminated data sets. In addition, the Fogra research project (No. 32.152) examined the effect of varnishing, which leads to similar, but smaller colour shifts than film lamination. The resulting varnished gloss depends strongly on paper and ink gloss and affects saturation and contrast. Since there are considerable differences in these material properties, no standard data sets for varnishing are made available as “FOGRAxx data”. However for individual high-quality production, the varnish data sets are available on the Fogra project web page. This applies also to UV varnish, which has about half the effect of film lamination. Here, FOGRA49 and FOGRA50 might serve as a rough estimate of what to expect. Again, for high-quality varnished jobs it is preferable to establish individual characterization data. This could be done by appropriate data adjustments based on the newly provided data sets.

Source: ECI.org

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Comments
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