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FLEXO Magazine : April 2011
Technologies & Techniques and post-G7 samples could then be submitted to IDEAlliance for review. The entire process lasted about 3 weeks, which included ample time for the IDEAlliance G7 staff to review the proof and print submissions and supporting data prop- erly. However, the first few days were critical in determining consistency, baseline measurements and adjustments that needed to be made to gray-balance their process. Although the specific road to a G7 Master qualification is somewhat different for every printer, the process for Revolu- tion Labels was fairly straightforward: • Consistency check: The first step was to establish a baseline status by running a series of live jobs without any tweaking to check for consistency in printing. • Measurement analysis: Using pressroom print analysis tools and software, spectral and density data was ana- lyzed onsite and a correction curve was created. (See Figure 1.) • Graphic file adjustments: Based on the correction curve, the art files and plates were adjusted to more closely align with the target color space. • Validation run: With the changes applied, a second run was conducted to validate the modifications; remarkably, the Revolution Labels team was successful with only the two runs. (See Figure 2.) • Submission and Review: The correction curve and samples were submitted to IDEAlliance for review; Revo- lution Labels received a G7 Master qualification on their first attempt. “It was a very hands-on process and well worth it,” says Spillers. “From the beginning, we could see how close we were to theoretical perfection in terms of being a solid match, press to proof. We ran through a standard density test and re- ally didn’t do anything to make our flexographic job align with G7 requirements, but the good news was that we were very close, right off the bat.” The first few baseline runs did indeed show that Revolution Labels was already very close to meeting G7 requirements. Us- ing the data from the measurement software, I worked closely with the offsite prepress group to create a set of correction curves. Once we had the G7 corrected plates, Revolution’s pressroom was able to reprint the P2P target, and we were able to validate a much closer match to our target color space. Figure 2. screen capture iDeAlliance Curve2 software analysis of the g7 P2P target. The nPDC curve is based on measurements from several print samples. While the CMY nPDC curves could be further refined to more closely match the target nPDC curve, we came fairly close with the first adjustment. 26 FLeXO APril 2011 www.flexography.org Getting G7 Master Program qualification has helped Revolution Labels: • Ensure a common visual match to offset output. • Put a defined, measurable and repeatable press- room process in place. • Reduce the possibility of errors and the costs as- sociated with them. • Gain a competitive edge.