发明名称 |
COLOR REPRODUCTION, PATTERN HIDING AND IMAGE ALTERNATIONS WITH HALFTONE PRINTS ON METAL |
摘要 |
We propose new methods for creating color or achromatic images that are printed with classical cyan, magenta, yellow and a white diffusing ink on a metallic substrate. We optimize the surface coverages of the cyan, magenta, yellow and white inks in order to create color prints on a metallic surface that look bright and colorful under specular reflection and also look good under non-specular observation conditions. We also provide new means for the prevention of counterfeits. A first effect enables viewing on the same metallic print one achromatic image in specular viewing mode and a second independent achromatic image in non-specular viewing mode. The second effect enables hiding a pattern such as text, graphics or a grayscale image within the printed color image in one viewing mode, specular or non-specular and showing that pattern in the second viewing mode, non-specular or specular, respectively. |
申请公布号 |
EP3109054(A3) |
申请公布日期 |
2017.01.11 |
申请号 |
EP20160174473 |
申请日期 |
2016.06.14 |
申请人 |
Ecole Polytechnique Fédérale de Lausanne (EPFL) |
发明人 |
PJANIC, Petar;HERSCH, Roger |
分类号 |
B41M1/28;B41M3/14;B42D25/30;B42D25/378;G07D7/00 |
主分类号 |
B41M1/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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