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A novel spectral trapping model for color halftones
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering.
Dept. of Informatics and Media, Beuth Hochschule Berlin University of Applied Sciences, Berlin, Germany,.
2018 (English)In: Journal of Print and Media Technology Research, ISSN 2223-8905, Vol. 7, no 3Article in journal (Refereed) Accepted
Abstract [en]

The amount of trapping has a great impact on the gray balance and color reproduction of printed products. The conventional trapping models are print density based and give percentage values to estimate the effect of trapping. In an earlier paper (Hauck and Gooran, 2011), a spectral trapping model was proposed, that defines the trapping effect as the DE* ab colorimetric differences between the real ink overlap (measurements) and the ideal ink overlap. All the trapping models proposed so far, however, only calculate the trapping value for full-tone (solid) ink overlap. As the trapping value for full-tone ink overlap could be overestimating the actual ink trapping effect for halftones, it is important to be able to also approximate the trapping value of color halftones. Furthermore, for a detailed gray balance shift analysis, there is a need to estimate the trapping effect for specific color halftones.

In the present paper, we propose a novel spectral trapping model that delivers the trapping value as DE* ab color difference for color halftones taking into account secondary and tertiary ink overlap.

The results of the experiments show that the trapping value for color halftones are much smaller than their corresponding trapping value at full-tone, but trapping value of halftones, besides other common quality parameters, should still be considered if some quality inaccuracy, such as gray balance shift, occurs in a print production.

Place, publisher, year, edition, pages
2018. Vol. 7, no 3
Keywords [en]
Ink trapping, Halftoning, Gray balance, Color difference (DE* ab), Printing quality
National Category
Media Engineering
Identifiers
URN: urn:nbn:se:liu:diva-151055OAI: oai:DiVA.org:liu-151055DiVA, id: diva2:1247451
Available from: 2018-09-12 Created: 2018-09-12 Last updated: 2018-09-20Bibliographically approved

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