Ministère de la Culture et de la Communication
Université Versailles Saint-Quentin


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Séminaire recherche du 15 juin à 14h

Séminaire extraordinaire de Francesca Gabrielli

par Laurent Tranchant - publié le

15 juin - 14h-15h
Francesca Gabrielli
Scientifique de la conservation au Rijksmuseum (Amsterdam, Pays-Bas)

Title : Reflectance imaging spectroscopy (RIS) to reveal artists’ materials use and distribution

Abstract : Reflectance Imaging spectroscopy (RIS) consists in the collection of spatially co-registered images in many contiguous spectral bands using highly sensitive imaging spectrometers. In the last 2 decades RIS, initially developed for the remote sensing field, has been extensively applied in the field of cultural heritage. Today is becoming a key technique, together with other complementary non -invasive chemical imaging techniques (namely MAXRF and MAXRPD), for the in-situ characterization of artists’ materials.

RIS is mainly performed from the near ultraviolet (UV) through the visible and into the near-infrared (NIR) spectral range, extending from 350 to 2500 nm. This spectral range encompasses electronic transitions that give rise to the color of pigments, in addition to overtones and combination bands arising from vibrational modes of chemical bonds, including functional groups such as OH, NH, CH, and CO3 present in pigments and binders. Using high spatial and spectral resolution imaging spectrometers, these characteristic spectral features have been identified and used to map many artists’ materials (pigments and paint binding media) distribution over the surface of polychrome objects. Furthermore, false color images, created combining different single wavelength images, can be used to visualize hidden drawings, painted sketches, and changes in composition.