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FLEXO Magazine : January 2013
conditions that include characterization data and/or Interna- tional Color Consortium (ICC) profiles per PDFX. These profiles define the relationship between the specified CMYK, and with CXF spot color data embedded in the PDFX, the final printed product. These profile families represent different combina- tions of color gamut’s that should have common hue angles. NOTE: Today, this is not the case in packaging, where supply chain partners typically request all file formats. A common file format per ISO will simplify the packaging requirements— PDFX 4 seems to be the ideal tool for com- munications 3. OVERVIEW The fundamental requirements of the package print supply chain are to: 1. Define the appearance of the product to be produced 2. Provide defined formats to allow the data represent- ing the designed product to be exchanged between all participants 3. Provide specifications for viewing, measurement, and proofing, so that all participants will “ view and mea- sure” in a common way 4. Provide the tools to allow common specification, evalu- ation and testing of input materials 4. REFERENCE DOCUMENTS The standards that include definition of printing conditions are: ISO 15339, Graphic Technology — Printing from Digital Data Across Multiple Technologies — Part 1: Principles and Characterized Reference Printing Conditions ISO 12647-2 , Graphic Technology — Process Control for the Production of Halftone Color Separations, Proof and Produc- tion Prints — Part 2: Offset Lithographic Processes ISO 12647-6 , Graphic Technology — Process Control for the Production of Halftone Color Separations, Proofs and Produc- tion Prints — Part 6: Flexographic Printing Committee for Graphic Arts Technologies Standards (CGATS) 21-1 , 2 Graphic Technology — Printing from Digital Data Across Multiple Technologies — Part 2: Reference Char- acterization Data-2012 In addition the applicable specifications for viewing and measurement are: ISO 3664, Graphic Technology and Photography — Viewing Conditions NOTE: Interval of changing bulbs should be 2,500 hours or six months or normal usage. Validation for correct lighting and ambient light requirements should be based on measurements. Booth should be press side for visual process control. ISO 12647-3 Munsell Farnsworth 100 Hue Testing (Color Blindness Testing) NOTE: Test should be administered on a quarterly basis to all team members involved in color related decision- making. All test results must be shared with the collective team to understand each member’s visual color discrimi- nation. All members must minimally achieve a score of “Average Discrimination.” 5. INSTRUMENTATION Because measurement of color is a critical issue in the packaging industry, special attention must be given to the selection, care, and identification of the measurement instru- ments used. Some of the key parameters to be considered are as follows. Instrumentation Calibration: The primary reference for instrument calibration is the instrument manufacturer ’s requirements. Calibration is when an instrument is sent back to the original equipment manu- facturer ’s (OEM’s) factory for adjustments and/or to validate calibration. Daily checks of the instrument/s are performed to insure they meet factory standards / calibration. Most manu- facturers require factory calibrations on an annual or every other-year basis. Instrument Identification, 0/45 Devices Device Name/ Serial Number Calibration Date Geometry Aperture Size L*a*b* Observer Viewing Angle (D50 2° for Graphic Arts) Spectral Reflectance per ISO 13655 Device Illuminant Defined (M0, M1, M2 M3) Screen view used in proper preparation of PDFX file. Color www.flexography.org january 2013 FLEXO 23