WAN-IFRA Magazine - December 2009 - (Page 25) www.wan-ifra.org/magazine 12.2009 INK SAVING ink saving the basis of such claims is unrealistic, alone due to the fact that the particular situation is unknown in each case and therefore cannot be compared (see below). Colour management as a solid foundation Colour management is the basis for controlling four-colour newspaper printing. Applied correctly, it ensures that colour originals from a wide range of different origins are prepared for printing in such a way that their colour is reproduced as faithfully as possible on newsprint. Because the colour space is considerably smaller in coldset (newspaper printing) than, for example, in heatset, certain compromises must be accepted. To ensure that this is done correctly, it is necessary to know (or determine) the colour profile (ICC profile) in which the image was created and transform it into the suitable output profile for the corresponding colour space of the output device (e.g. newspaper press). This colour space transformation (“gamut mapping”) is realised usually indirectly via a device-independent standard colour space (CIELAB or XYZ); the use of so-called DeviceLink profiles shortens this process, as a colour value of the output colour space is assigned to each colour value of the input colour space and can be accessed directly without conversion. An advantage of DeviceLink technology is that the black channel can be retained. Besides images supplied in a RGB profile, there are, for example, also ads (mostly as PDF) that are received already colour-separated in CMYK. If the separation was done with a profile not optimised for this purpose (e.g. ISOnewspaper26), but for example with ISOcoated, then a re-separation (CMYK to CMYK) is necessary. Saving ink without visible consequences – how does it work? Ink-saving software – in accordance with the principle of maximum economic efficiency – by using the minimum amount of expensive colour ink, should supply a printed image that cannot be distinguished either visually or by measurement from one that would have been obtained without the ink reduction. Grey Component Replacement (GCR), sometimes combined with Under Colour Removal (UCR) and manufacturer-specific algorithms, is the most commonly used process. GCR reduces grey components of the colour inks and replaces them with a much smaller amount of black. This has almost no effect on the colour impression, especially if a moderate reduction is carried out. In the case of a strong GCR, colour shifts become visible first of all in the light colour tones, where minor differences (from one batch to the next) in inks and paper as well as density fluctuations become more evident. Just how much can be saved without adverse consequences for quality depends decisively on the conditions at the outset. On the one hand, the achievable savings are dependent on the motif concerned – the more colour-intensive an image is and the more mixed colours it contains, the greater the potential savings. On the other hand, it naturally also makes a difference whether it is data already optimised for the process that is concerned (in this case, the yield will not exceed 10-15 percent). Moreover, it is for the newspaper to decide whether it deviates from the maximum recommended ink coverage for newspaper printing of currently 240 percent (ISO standard) and go for 220 percent or even lower total coverage, which would bring about additional consumption savings. For example, Wegener, the largest publisher of regional newspapers in the Netherlands, is at present carrying out intensive tests with ink-saving software at its printing plant in Best. The company expects savings of several hundred thousand euros alone from a reduction of the maximum ink coverage on all pages from 240 to 180 percent. The printing On the website Ink saving software suppliers describe how their products are used and what they achieve: W Dr. Hauke Berndt, ppi Media Article ID 10698 W Rinus Hoebeke, Kodak Article ID 10699 W Barry Landsberg, Agfa Article ID 10725 W Izzet Edige, New ProImage Article ID 10763 W Denise Fedder, Presteligence Article ID 10702 W Bernd Luts, OneVision Article ID 10728 http://www.wan-ifra.org/magazine http://www.ifra.com/articles/10698 http://www.ifra.com/articles/10699 http://www.ifra.com/articles/10725 http://www.ifra.com/articles/10763 http://www.ifra.com/articles/10702 http://www.ifra.com/articles/10728 Table of Contents for the Digital Edition of WAN-IFRA Magazine - December 2009 Our Viewpoint Developments Beyond 2009: Reaching out across time and space Business Report 2009 Advertising: What works now? More quality through ink saving Automating plate processing Industry Updates WAN-IFRA Bulletin WAN-IFRA Services WAN-IFRA Magazine - December 2009 WAN-IFRA Magazine - December 2009 - (Page 1) WAN-IFRA Magazine - December 2009 - (Page 2) WAN-IFRA Magazine - December 2009 - Our Viewpoint (Page 3) WAN-IFRA Magazine - December 2009 - Our Viewpoint (Page 4) WAN-IFRA Magazine - December 2009 - Our Viewpoint (Page 5) WAN-IFRA Magazine - December 2009 - Developments (Page 6) WAN-IFRA Magazine - December 2009 - Developments (Page 7) WAN-IFRA Magazine - December 2009 - Developments (Page 8) WAN-IFRA Magazine - December 2009 - Developments (Page 9) WAN-IFRA Magazine - December 2009 - Beyond 2009: Reaching out across time and space (Page 10) WAN-IFRA Magazine - December 2009 - Beyond 2009: Reaching out across time and space (Page 11) WAN-IFRA Magazine - December 2009 - Beyond 2009: Reaching out across time and space (Page 12) WAN-IFRA Magazine - December 2009 - Beyond 2009: Reaching out across time and space (Page 13) WAN-IFRA Magazine - December 2009 - Business Report 2009 (Page 14) WAN-IFRA Magazine - December 2009 - Business Report 2009 (Page 15) WAN-IFRA Magazine - December 2009 - Business Report 2009 (Page 16) WAN-IFRA Magazine - December 2009 - Business Report 2009 (Page 17) WAN-IFRA Magazine - December 2009 - Business Report 2009 (Page 18) WAN-IFRA Magazine - December 2009 - Business Report 2009 (Page 19) WAN-IFRA Magazine - December 2009 - Advertising: What works now? (Page 20) WAN-IFRA Magazine - December 2009 - Advertising: What works now? (Page 21) WAN-IFRA Magazine - December 2009 - Advertising: What works now? (Page 22) WAN-IFRA Magazine - December 2009 - Advertising: What works now? (Page 23) WAN-IFRA Magazine - December 2009 - More quality through ink saving (Page 24) WAN-IFRA Magazine - December 2009 - More quality through ink saving (Page 25) WAN-IFRA Magazine - December 2009 - More quality through ink saving (Page 26) WAN-IFRA Magazine - December 2009 - More quality through ink saving (Page 27) WAN-IFRA Magazine - December 2009 - Automating plate processing (Page 28) WAN-IFRA Magazine - December 2009 - Automating plate processing (Page 29) WAN-IFRA Magazine - December 2009 - Industry Updates (Page 30) WAN-IFRA Magazine - December 2009 - Industry Updates (Page 31) WAN-IFRA Magazine - December 2009 - WAN-IFRA Bulletin (Page 32) WAN-IFRA Magazine - December 2009 - WAN-IFRA Bulletin (Page 33) WAN-IFRA Magazine - December 2009 - WAN-IFRA Services (Page 34) WAN-IFRA Magazine - December 2009 - WAN-IFRA Services (Page 35) WAN-IFRA Magazine - December 2009 - WAN-IFRA Services (Page 36) http://www.nxtbook.fr/nxtbooks/ifra/2010_0910_en http://www.nxtbook.fr/nxtbooks/ifra/2010_0708_en http://www.nxtbook.fr/nxtbooks/ifra/2010_extra06_en http://www.nxtbook.fr/nxtbooks/ifra/2010_0506_en http://www.nxtbook.fr/nxtbooks/ifra/2010_extra04_en http://www.nxtbook.fr/nxtbooks/ifra/2010_0304_en http://www.nxtbook.fr/nxtbooks/ifra/2010_0102_en http://www.nxtbook.fr/nxtbooks/ifra/2009_12_en http://www.nxtbook.fr/nxtbooks/ifra/2009_11_en http://www.nxtbook.fr/nxtbooks/ifra/2009_10_en http://www.nxtbook.fr/nxtbooks/ifra/2009_08_en http://www.nxtbook.fr/nxtbooks/ifra/2009_07_en http://www.nxtbook.fr/nxtbooks/ifra/2009_06_en http://www.nxtbook.fr/nxtbooks/ifra/2009_05_en http://www.nxtbook.fr/nxtbooks/ifra/2009_04_en http://www.nxtbook.fr/nxtbooks/ifra/2009_02_en http://www.nxtbook.fr/nxtbooks/ifra/2009_01_en http://www.nxtbook.fr/nxtbooks/ifra/2008_12_en http://www.nxtbook.fr/nxtbooks/ifra/2008_10_en http://www.nxtbook.fr/nxtbooks/ifra/2008_09_en http://www.nxtbook.fr/nxtbooks/ifra/2008_08_en http://www.nxtbook.fr/nxtbooks/ifra/2008_07_en http://www.nxtbook.fr/nxtbooks/ifra/2008_06_en http://www.nxtbook.fr/nxtbooks/ifra/2008_05_en http://www.nxtbook.fr/nxtbooks/ifra/2008_04_en http://www.nxtbook.fr/nxtbooks/ifra/2008_03_en http://www.nxtbook.fr/nxtbooks/ifra/2008_02_en http://www.nxtbook.fr/nxtbooks/ifra/2008_01_e http://www.nxtbook.fr/nxtbooks/ifra/2007_12_nt http://www.nxtbook.fr/nxtbooks/ifra/2007_11_nt http://www.nxtbook.fr/nxtbooks/ifra/2007_10_nt http://www.nxtbook.fr/nxtbooks/ifra/2007_08_nt http://www.nxtbook.fr/nxtbooks/ifra/2007_07_nt http://www.nxtbook.fr/nxtbooks/ifra/2007_06_nt http://www.nxtbook.fr/nxtbooks/ifra/2007_05_nt http://www.nxtbook.fr/nxtbooks/ifra/2007_04_nt http://www.nxtbook.fr/nxtbooks/ifra/2007_03_nt http://www.nxtbook.fr/nxtbooks/ifra/2007_02_nt http://www.nxtbook.fr/nxtbooks/ifra/2007_01_nt http://www.nxtbook.fr/nxtbooks/ifra/2006_12_nt http://www.nxtbook.fr/nxtbooks/ifra/2006_11_nt http://www.nxtbook.fr/nxtbooks/ifra/2006_10_nt http://www.nxtbook.fr/nxtbooks/ifra/2006_08_nt http://www.nxtbook.fr/nxtbooks/ifra/2006_07_nt http://www.nxtbook.fr/nxtbooks/ifra/2006_06_nt http://www.nxtbook.fr/nxtbooks/ifra/2006_05_nt http://www.nxtbookMEDIA.com
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