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Digital Offset Printing – Going Beyond 4 Colors

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While 4-color CMYK printing is the norm for mainstream offset printing, all HP Indigo digital presses have the option of printing with up to 5, 6 or 7 different colors. These extra color stations can be used to improve image quality by increasing the color gamut, decreasing graininess, reducing illumination sensitivity, or adding special effects to the printed output. The HP IndiChrome PantoneĀ® certified ink mixing system is one key enabler of these improvements, allowing customers to create PantoneĀ® or custom-matched spot colors at their own site.

In this paper, we show how the color gamut of a digital press can be increased through the use of additional full-density inks, such as green and violet. We also show how the graininess of a print can be decreased through the use of light inks. In particular, we show how the addition of a gray ink can decrease the illumination sensitivity, improve the gray neutrality, and reduce the graininess of a print. Finally, we highlight some of the special effects that can be created when using specialty inks such as the digital matte ink.
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Document Type: Research Article

Publication date: 2006-01-01

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  • For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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