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FLEXO Magazine : February 2014
Image 7: A screenshot of “PatchFinder,” a customized tool used to find the closest build on the color book and the exact location of the patch that represents the actual outcome on the press al) or No-K, illuminant D50 and absolute colorimetric render- ing intent. The use of UCR makes sense for jobs where some black is included in the fingerprint in order to increase the accuracy of the ICC Profile, even when black is not used later for the actual color builds. This ICC Profile serves two purposes: To be used in a color analyzing software and to be loaded into a spe- cially developed tool we call the “PatchFinder. ” IMPLEMENTING PENTACHROME—STEP 3 In the third step, the fingerprint’s ICC Profile is loaded in a color analyzer software (like the one shown in Image 6) in order to get a first approximation, through L*a*b* values and Delta E, of the build needed to reach the de- sired final color. Either a color from a standard library like Pantone or a given sample, to be emulated via a connected spectrophotometer, can be used as a reference. The software gives the suggested build that can be fine- tuned on screen, if necessary. In Image 6 we see this as cyan 52.3 percent + yellow 85.3 percent + PMS 354 at 99.7 percent. The parameters for the comparison are D50, Delta E 2000 and a minimum ink coverage of 8 percent, which in our experience can be comfortably reproduced by the press. We also select a maximum number of three channels to help keep the total ink limit in check—around 230 percent or less—in order to avoid rubbing issues due to an excess of ink on the substrate. The mutual reinforcement of process and spot colors is more effective than a double shot of a single color. This is because of the complex optical phenomena that take place in non woven substrates while the subtractive synthesis is at work, involving refraction and reflection between the fibers themselves and the background film. Image 8: Comparative two dimensional view of gamut between ISO coated 12647 (red space), standard impression on non woven substrate (white space) and Pentachrome color reinforcement (green space) 44 FLEXO FEBRUARY 2014 www.flexography.org