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FLEXO Magazine : July 2012
for instance, an image of people would gener- ally require less chroma expansion to reach its optimum level than an image of a rain forest. Fortunately, prepress providers can use soft- ware to selectively add chroma to images where needed when separat- ing for expanded gamut by adjusting the channel output of that image. When choosing images for an expanded gamut package or label, design- ers should consider bold and colorful images that can take advantage of this chroma enhance- ment for maximum store shelf impact. Additionally, expanded gamut printing creates many more design opportunities by increasing the flexibility of tints and gradations. With the CMYK + Spot methodology of printing, any spot color that the designer wishes to have as both a solid and a screen usually requires either two separa- tions (and a subsequent trap line), limiting even further the amount of colors that could be used on the job. Alternatively, the job could run as a combination separation, functioning as a not-so-happy medium to achieve adequate solid coverage and relatively low press gain. To make matters worse, screens of spot color generally do not print higher than 100 lpi, creating a course texture and noticeable dot pattern, rather than a smooth gradation. With expanded gamut, these concerns disappear, as the entire set of base colors can print as solids or screens at a much finer line count. That having been said, color builds can have some major impacts on any tints, gradations, transparencies, vignettes or glows that the designer wishes to use. Since spot colors will be broken down into a tint of the base colors, dropouts can occur at unexpected values, depending upon the color recipe. A subtle glow on top of a light blue background, for in- stance, might cause magenta dropouts at a tint of 30 percent. To compensate, prepress providers might need to overprint areas of minimum base coverage in these places, which could diminish the visual impact. They could also use a transitional screen (like an AM/FM hybrid) that could lead to negative con- * Drastically reduced sleeve cost * Press speeds in excess of 1700 fpm * Unparalleled flexographic print quality * Unmatched ink transfer and densities * 175 Line Screen * 2 - 6 times the longevity of a polymer * Fastest in the round imaging, period! * Excellent registration Carey Color Inc. Sharon Center, Ohio, USA 330-239-1835 800-555-3142 Gary Moravcik, President & CEO Kodak Flexcel Direct Imager = Dr. Douglas J. Edwards (Kodak) & Gary Moravcik (Carey Color) at Drupa (President) Digital, Packaging & Functional Printing (President & CEO) Emma Schlotthauer (Kodak) & Gary Moravcik (Carey Color) at Drupa (Marketing Manager) Packaging Solutions GC WW Packaging Products www.careyweb.com C M Y CM MY CY CMY K CAREY_FLEXO_AD.pdf 1 5/31/12 3:54 PM 42 FLEXO july 2012 www.flexography.org Tyler Mills inspects a process image with an orange channel added to enhance the chroma of the cheese puffs.