Scholefield, AdamVetterli, MartinBellouard, YvesPacholska, MichalinaBaechler, GillesLatty, Arnaud2019-12-052019-12-052019-12-052019https://infoscience.epfl.ch/handle/20.500.14299/163684The present disclosure concerns a multi-spectral image printing method. The method includes the steps of: - providing a multi-spectral image; - providing a material; - determining changes in a refractive index value of the material permitting to reproduce the multi-spectral image when the material is illuminated; and - generating the changes in refractive index value in the material.patentEP3697740US11248959US2020278251EP3697740WO201907758964457046