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FLEXO Magazine : February 2012
Take the customer-supplied proof, place it on the surface that is within the ISO 12647-2 specification and take measure- ments with a spectrodensitometer. The subsequent measure- ment becomes the reference color to use when checking color on press. You must remember that when checking color on press, measurements must be taken on the identical surface and lighting environment that the reference color was obtained. If a customer had a 1.5ΔE tolerance on a previous press- run utilizing a high quality coated stock, but is specifying newsprint quality paper for this pressrun, maintaining the same 1.5ΔE tolerance consistently on press is unrealistic, and should be classified as an unrealistic tolerance. Adjust your customer's expectations accordingly. BOTTOM LINE Whether you build your color control process in one all-encompassing leap or one "stepping stone" at a time, consistent color measurement is the core component to any successful strategy. You may use a simple handheld spec- trodensitometer or more sophisticated inline device. The difference is measured only in time and efficiency. Highly accurate color measurement devices, operators skilled in the practice of using them and clear-cut guidelines to follow provide a sound foundation to build upon your color quality control process, even one "stepping stone" at a time. About the Authors: Bob Byrnes, director, technical services, TECHKON USA, focuses on color measurement systems for corporate accounts in the package printing industry. Bob has played an integral role in implementing color measur- ing strategies for packaging printers large and small, and helping to configure color measurement/quality assurance systems for both printers and their brand managers. He welcomes your questions and comments at bbyrnes@techko- nusa.com. Barbara McGowan is an industry marketing consultant specializing in print automation and color control. With a focus on communication design, she produces multimedia content for print, web and video and can be contacted at firstname.lastname@example.org. www.flexography.org FEBRUARY 2012 FLEXO 35