by clicking the arrows at the side of the page, or by using the toolbar.
by clicking anywhere on the page.
by dragging the page around when zoomed in.
by clicking anywhere on the page when zoomed in.
web sites or send emails by clicking on hyperlinks.
Email this page to a friend
Search this issue
Index - jump to page or section
Archive - view past issues
FLEXO Magazine : May 2014
been awarded a 2014 FTA Technical Innovation Award in the prepress graphics category. Commenting on the award, Samworth reflects, “There’s a lot of great new flexo technology out there. For a committee of industry experts to objectively select Equinox as the most valuable technology of the year is a great compliment to the development team at Esko. Receiving this award will help fur- ther the adoption of Equinox in the flexo industry and encour- age Esko to continue its large development commitment. That will be good for the flexo industry as whole. ” EXPANDING COLOR In developing Equinox, Esko examined how current 4-color management technologies could be applied to 7-color. After studying ways to make 7-color profiles using all combinations of CMYKOGV and ICC formats, the company found it could get more accurate profiles and, therefore, greater color accuracy by using 7-color profiles that consisted of relevant combinations of four colors. Instead of fingerprinting and profiling all combinations of CMYKOGV, four combinations of four colors are used: • CMYK • OMYK • CGYK • CMVK “It was early in the inventive stage that we found these 4-color combinations of seven colors were capable of color accuracy in the range of custom mixed inks, but we didn’t re- ally see the benefits of applying Equinox technology to imag- es until we began testing with a major CPC on real, live jobs,” Samworth explains. “ We realized that most package designs today contain photographic images, and how dull and lifeless the CMYK images looked on the 7-color package design. With 7-color gamuts that range an average of 70 percent larger than 4-color gamuts, we knew we had the potential for signif- icant improvements in photographic image quality—we just needed to develop the math to make the conversions.” Moving from RGB to 7-color was fairly straightforward. But since most packaging images are CMYK, Esko wanted to find a way to convert 4-color CMYK to 7-color in a way that takes advantage of the full 7-color gamut. In researching different algorithms, the team discovered that the “mathematical max- imum” gamut expansion looked great on some images, but provided too much on others. Samworth gives as an example an image containing flesh tone and a peach. Both are tan col- ored and have similar L*a*b* values, but applying the max- imum gamut expansion to the peach increased perceived Image conversion translates to increased quality as images are reproduced with 7-color gamuts that are far closer to real life than traditional 4-color gamuts. 32 FLEXO | MAY 2014 By the end of this decade, the volume of expanded gamut printing will likely surpass the volume of spot color and CMYK + spot color printing.