Glossmark technology: beyond halftone frequencies

Shen-ge Wang; Chu-heng Liu; Beilei Xu

doi:10.1117/12.588595

17 January 2005 Glossmark technology: beyond halftone frequencies

Shen-ge Wang, Chu-heng Liu, Beilei Xu

Proceedings Volume 5667, Color Imaging X: Processing, Hardcopy, and Applications; (2005) https://doi.org/10.1117/12.588595
Event: Electronic Imaging 2005, 2005, San Jose, California, United States

Abstract

Glossmark technology is a halftone-based digital imaging process to embed visible watermarks into xerographic color prints. The gloss of a xerographic print depends not only on surface roughness of paper and toner, but also on the microscopic structure created by the halftone process. The surface relief of a halftone image can be treated as a two-dimensional phase grating. The shape, or profile, of the surface relief determines the reflected pattern of the illumination. A strong angular differential gloss can be obtained by employing two anisotropic halftone screens in the halftone process. A careful design of these screens enables embedding Glossmark images while maintaining the high quality of the color reproduction. The printing process, that simultaneously creates high quality primary and Glossmark images in a single step, requires neither special equipment nor special paper or toner. Glossmark images, shown in a high contrast of gloss, provide a perfect simulation of the traditional paper watermarks, while their digital implementation makes it easy to embed variable data as digital watermarks into individual documents.

Citation Download Citation

Shen-ge Wang, Chu-heng Liu, and Beilei Xu "Glossmark technology: beyond halftone frequencies", Proc. SPIE 5667, Color Imaging X: Processing, Hardcopy, and Applications, (17 January 2005); https://doi.org/10.1117/12.588595

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