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FLEXO Magazine : January 2013
NOTE: 0/45 or 45/0 devices are for reading flat colors without; metallic, strong gloss reflectance, or heavy matte coatings. Instrument Identification, Spherical Devices Device Name/ Serial Number Calibration Date Geometry (Specular included or excluded) Aperture Size L*a*b* Observer Viewing Angle (D50 2° for Graphic Arts) Spectral Reflectance Device Illuminant Defined (M0, M1, M2 M3) NOTE: Spherical devices are for measuring metallic, pearlesences, heavy matte or gloss coatings. Instrument Identification, Multi-Angle Devices Device Name/ Serial Number Calibration Date Geometry Aperture Size L*a*b* Observer Viewing Angle (D50 2° for Graphic Arts) Spectral Reflectance Device Illuminant Defined (M0, M1, M2 M3) NOTE: “Multi-angular devices are for measuring pearlesence, metallic inks or colors with special effects. Multiple angle measurements can be used in different proprietary characterization models.” In-line real time instruments for color mea- surements are commonly used in packaging. Including information relating to those instru- ment types is relevant and pertinent. It is important to clearly separate the follow- ing cases: 1. spectral instruments capable of mea- suring in full accordance with ISO 13655 2. spectral instruments not fully in agree- ment with ISO 13655 but providing spectral data with a resolution within specification 3. non spectral instruments (normally camera based) Web inspection systems—are commonly used for real time defect mode detection. There are a multitude of available systems based on different technologies and providing differ- ent levels of detection and performance (e.g. “ gold standard” based, full width 100 percent inspection, etc.) 6. COLOR MANAGEMENT Although reference-printing conditions are the key defini- tion of the relationship between device data and printed color, ICC profiles based on these characterization data are a critical element in the packaging workflow. ICC profiles are embedded in PDF/X files to communicate the customer ’s expectation to the rest of supply chain. 7. FILE FORMATS All data exchange is based on ISO 15390-7 , Graphic Tech- nology—Prepress Digital Data Exchange Using PDF — Part 7: Complete Exchange of Printing Data (PDF/X-4) and Partial Exchange of Printing Data with External Profile Reference (PDF/X-4p) Using PDF 1.6 Colors colors 24 FLEXO january 2013 www.flexography.org