17 November 2023

14:00 – 14:45

Amphithéâtre Faure

Patrick Caillet

Patrick Caillet holds a post-graduate diploma (DEA) in geophysics, a post-graduate diploma (DEA) in computer graphics (ENSTA) and a doctorate in building sciences and techniques. He is qualified to direct research in computer graphics. He has taught at several prestigious schools and universities. He has directed theses and projects on photonics and the visual restitution of objects and digitized heritage involving renowned French institutions such as the Louvre, the Musée national des Arts asiatiques, the Basilique de Saint-Denis, the Bibliothèque nationale de France, the Fondation Royaumont and several engineering schools. His fields of research focus on the restitution of appearance based on the physics of color. French delegate to the Association Internationale de la Couleur (AIC) and associate editor of the international journal Color research and application (Wiley), he is also co-founder of the GDR-CNRS Appamat. He is the author and co-author of several books, numerous international articles and scientific films.

Conference: Colours with and without dyes?

Modeling color, and more specifically light-matter interaction, enables us to see what was and what could be. Seeing in color and reproducing color requires in-depth knowledge of the three inseparable players: the observer, light and matter. Virtual archaeology, like the design of materials and products, has every interest in simulating the appearance of objects from the past or those of the future, and must be based on solid scientific foundations. Geometric optics, electromagnetism, plasma physics and the observation and understanding of the living world are all called upon via spectral appearance simulation models, themselves based on colorimetry and its instruments. The living world provides a wealth of examples where the energies required to manufacture materials are at a minimum coût for generally optimal performance, or high enough to remain compatible with other functionalities. Camouflage, flight, signaling, seduction, warning, protection, reproduction, temperature regulation, etc. are essential functions. We will give visual examples taken from these three major fields of knowledge: archaeology, design and bio-inspiration.