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Evolutions in food packaging printing

You are here: Conferences & Events * 2008 Valencia * Abstracts * 4. Color reproduction and quality

4. Color reproduction and quality

4.07. Predictability of spot color overprints

Robert Chung, Michael Riordan, Sri Prakhya

Rochester Institute of Technology, School of Print Media
69 Lomb Memorial Drive, Rochester, NY 14623, USA
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Pre-media software packages, e.g., Adobe Illustrator, do amazing things. They give designers endless choices of how line, area, color, and transparency can interact with one another while providing the display that simulates printed results. Most prepress practitioners are thrilled with pre-media software when working with process colors. This research encountered a color management gap in pre-media software's ability to predict spot color overprint accurately between display and print. In order to understand the problem, this paper (1) describes the concepts of color portability and color predictability in the context of color management, (2) describes an experimental set-up whereby display and print are viewed under bright viewing surround, (3) conducts display-to-print comparison of process color patches, (4) conducts display-to-print comparison of spot color solids, and, finally, (5) conducts display-to-print comparison of spot color overprints. In doing so, this research points out why the display-to-print match works for process colors, and fails for spot color overprints. Like Genie out of the bottle, there is no turning back nor quick fix to reconcile the problem with predictability of spot color overprints in pre-media software for some time to come.

Keywords: Color management, overprint, portability, predictability, spot color


4.08. Quality control and colour assessment for flexography and gravure printing based on machine vision

Andrés Navarro-López, José F. Caballero-Aroca, José J. Esteve-Taboada, Juan Hervás-Juan, Emilio Ribes-Gómez

AIDO - Technological Institute for Optics, Colour and Imaging, Machine Vision Department
Parque Tecnológico, C/Nicolás Copérnico, 7, 46980 Paterna (Valencia), Spain
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Nowadays in-line machine vision systems for quality control are becoming popular, allowing automation of human tasks, lowering costs and improving quality control in many industrial processes. There are many applications for machine vision systems in the printing industry. Flexography and gravure are maybe the most critical tasks due to the speed and inspection width (up to 2 meters) considered in the printing jobs. Existing commercial systems for web-press printing are based on matrix sensor cameras with a strobe moving through an axis in a direction normal to the printing line, forming a mosaic of samples and acting as a simple visual aid to the operator. Thanks to the progress on current imaging hardware quality control, the authors propose an innovative, dual BN-RGB inspection system which implements high-speed, high-resolution linear cameras and adaptive calibration algorithms, allowing 100% inspection of the paper sheet.

Keywords: Colour assessment, machine vision, printing quality control, 100% inspection


4.09. Developing a test-procedure for newsprint color quality evaluation

Fons Put

Flemish Innovationcenter for Graphic Communication
Campus Blairon 5, 2300 Turnhout, Belgium
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The adoption of the ISO 12647 printing standard is increasing significantly. Especially in commercial offset the ISO 12647-2 printing standard is the subject of standardization and certification projects. Also for newsprint the trend for standardized printing is clear. To assure consistent exchangeable color quality the gathered Belgian newspaper publishers promote the use of the ICC-profile "ISOnewspaper26v4.icc" as the color space for ad delivery. This color profile is based on the ISO 12647-3 printing standard. Customers are also becoming aware of the existence and advantages of standardized printing. We noticed several "open counter public bidding"-projects in which printing according to standards was included for objective color quality assesments.

Keywords: ISO 12647-3, newspaper printing, standardization

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