Printing technique hides one image behind the other

Just tilt the photo to see another hidden picture! A new printing technique hides one image behind the other.   Watch how it works in the video…

Thanks to EPFL software, hidden elements can now be placed into an inkjet printed image, becoming visible by simply rotating the print.

EPFL scientists have developed a printing algorithm that does just that onto metallic sheets.

Two images are printed together using an inkjet printer so that only one image can be seen at a time from a given angle.

The technique could one day be used as a security element in passports and printed money to prevent counterfeit.

Hersch of EPFL’s Peripheral Systems Laboratory, said:

“Elements can only be seen upon rotation. This rotation effect has never been done before.”

source EPFL