I'm sure many of you remember the once popular holographic images that are at different angles showed other images. Researchers at the École Polytechnique Fédérale de Lausanne (EPFL) developed a special printing technique, which allows to create such "me" picture.To do this, the printer combines the two images on the same plate, and if you look at it from one angle, we can see one picture, but if you turn it by 90 degrees, as the picture changes to another.
"The printer causes the ink in the form of tiny dots by a special technique. Different patterns of cyan, magenta and yellow dots reproduce a wide range of colors. When these terms are applied along the lines of the metal sheet, the final color varies with viewing angle. This is due to the fact that light passing through the ink line projected onto the metal surface colored shadows. The lines are perpendicular to the light, creating a large shadow and appear as "bright colors", and those that are arranged in parallel - do not cast shadows and show the "weak color. "When you turn 90 degrees to the line they change places and thus change the picture," - explained the researchers.
At present this technology works only with the use of inkjet printers, and metal surfaces. Employees of the institute believe that their development can be used in a variety of areas, including security. For example, so you can print security features on passports, identity cards and other documents.
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