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New Book Describes Current Comparison of Waterless Printing to Conventional Lithographic Printing

05 Jan 2012 12:45 PM | Keiji Obata (Administrator)
By Arthur W. Lefebvre

In March 2011, IWPA conducted a G7 comparative print test between waterless and conventional offset printing.  The results of the test are published in a white paper titled “A current comparison of waterless printing to conventional lithographic printing.” The 32-page white paper, authored by Gene Langlais of Capricorn Research, is available exclusively through the IWPA. The white paper is available free of charge to all current IWPA members. Non-members can purchase the white paper for $149.00.

Highlights

Waterless shows advantage in color space compared to conventional offset, indicating that a slightly larger color space is possible with waterless.  Color stability for waterless was better throughout the pressrun using the G7 aimpoints.

Waterless printed with consistently lower dot gain than conventional wet offset.

Start-up waste was significantly lower for waterless, requiring roughly 40% fewer sheets at start-up to achieve G7 aimpoint densities.

Waterless reached and maintained target ink densities on all subsequent restarts.

What is G7? Developed in the USA, G7® is IDEAlliance’s industry-leading set of best practices for achieving gray balance and is the driving force for achieving visual similarity across all print processes.

G7® is a method defined by the Print Properties and Colorimetrics Working Group of IDEAlliance. The application of this method enables printers to reproduce a similar visual appearance across printing types and substrates.  Today, through the PPC Working Group, experts from across the spectrum of printing disciplines contribute to this important IDEAlliance Methodology. G7® specifies the components of an image that define a similar “visual appearance” to the human eye.

To do this, the G7 Method:

  • Defines a colormetric definition for gray balance, and
  • Specifies gray balance in the midtones, image weight and image contrast from the highlights to the shadows, which are the factors that determine likeness of the visual appearance of an image.
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