We can measure without contact, in the laboratory and in the field, the optical properties (absorption, scattering) of the pigments, including the spectral response in the visible and near infra-red ranges, as well as their bi-directional reflectance function. This optical response is connected to the chemical and mineral composition of the pigments and to the shape of the grains. In theory, it should be possible to extract the chemical and physical parameters of the pigments from their optical response. However, we do not have at the moment a physical model that correctly simulates the color variations observed in pictographs. Thesis goal: Create a physical model that connects the optical properties of the pigments used in cave paintings, and measured in-situ, to their physical and chemical properties: chemical composition of the minerals and binders, granulometry, texture. That model will be based on a physical model of radiative transfer inside the pigment layer.
Plus d’informations :
[Site web ABG]