Yule-Nielsen based multi-angle reflectance prediction of metallic halftones

Vahid Babaei; Roger D. Hersch

doi:10.1117/12.2076380

8 February 2015 Yule-Nielsen based multi-angle reflectance prediction of metallic halftones

Vahid Babaei, Roger D. Hersch

Author Affiliations +

Proceedings Volume 9395, Color Imaging XX: Displaying, Processing, Hardcopy, and Applications; 93950H (2015) https://doi.org/10.1117/12.2076380
Event: SPIE/IS&T Electronic Imaging, 2015, San Francisco, California, United States

Abstract

Spectral prediction models are widely used for characterizing classical, almost transparent ink halftones printed on a diffuse substrate. Metallic-ink prints however reflect a significant portion of light in the specular direction. Due to their opaque nature, multi-color metallic halftones require juxtaposed halftoning methods where halftone dots of different colors are laid out side-by-side. In this work, we study the application of the Yule-Nielsen spectral Neugebauer (YNSN) model on metallic halftones in order to predict their reflectances. The model is calibrated separately at each considered illumination and observation angle. For each measuring geometry, there is a different Yule-Nielsen n-value. For traditional prints on paper, the n-value expresses the amount of optical dot gain. In the case of the metallic prints, the optical dot gain is much smaller than in paper prints. With the fitted n-values, we try to better understand the interaction of light and metallic halftones.

Citation Download Citation

Vahid Babaei, Vahid Babaei, Roger D. Hersch, Roger D. Hersch, "Yule-Nielsen based multi-angle reflectance prediction of metallic halftones", Proc. SPIE 9395, Color Imaging XX: Displaying, Processing, Hardcopy, and Applications, 93950H (8 February 2015); doi: 10.1117/12.2076380; https://doi.org/10.1117/12.2076380

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