CONTRIBUTION OF SPATIAL AND SPECTRAL IMAGING TECHNIQUES TO THE RE-EXAMINATION OF CONSERVED BUT POORLY DOCUMENTED WALL PAINTINGS FOR THEIR LONG TERM PRESERVATION: APPLICATION TO THE WALL PAINTINGS OF THE DUCAL PALACE OF GERMOLLES
Germolles' palace, private country estate of Margaret of Flanders, Duchess of Burgundy, is certainly one of the best preserved princely residence of its category (end of the 14th c.) in France. Its mural decorations rediscovered in the 1970s under modern plaster applied in the 19th in the course of modernisation were conserved in 1989-1991. The treatment consisted in filling the holes left by the chipping process and using the tratteggio retouching technique for visual integration between original and repaired portions of the paintings. No trace of the expensive metallic decoration (tin foils uncoated white and green in addition to vermeil-coated) mentioned in the medieval records (accounting notes) had been revealed yet.
The Germolles case study aims at re-documenting the palace unique wall paintings using the most innovative spatial and spectral imaging techniques (macro and micro-technical photography, photogrammetry, reflectance transformation imaging, structured light imaging, spectro-colorimetry, multispectral imaging, IR thermography) in combination to more traditional non-invasive or slightly invasive analytical techniques such as X-ray fluorescence or laser induced breakdown spectroscopy. The level of originality of the paintings versus conservation work will be determined as well the extent of original material including metallic remains. The performance of the techniques will be compared to develop guidelines that suit the best the documentation of historical wall paintings.
The methodology developed on currently exposed wall paintings will be applied on the other untouched original decorations once they are exposed. Eventually all these information will serve the virtual 3D reconstruction of the wall paintings which will show them as they might have appeared in the medieval times.
COSCH WG meeting in St. Etienne 27 March 2015: presentation
COSCH WG meeting in Neuchâtel 13 October 2015: presentation
COSCH WG meeting in Valletta 18 April 2016: presentation
Case Study Final Report: PDF
Recommendation for solution providers as well as end users (PT6): PDF
The project was led by
Dr Christian Degrigny, leader of COSCH WG4 (Restoration and analysis of CH surfaces and objects).
- Dr Vincent Detalle, Laboratoire de Recherche des Monuments Historiques – LRMH
- Dr Alamin Mansouri, Laboratoire Electronique, Informatique et Image, Université de Bourgogne, UFR Sciences et Techniques – Le2i
- Dr Aurélie Mounier, Institut de Recherche sur les ArchéoMATériaux, UMR 5060 CNRS / Université Bordeaux 3, Centre de Recherche en Physique Appliquée à l'Archéologie - IRAMAT-CRPAA
- Dr Marcello Picollo, "Nello Carrara Institute" for Applied Physics of the National Research Council - FAC-CNR
- Prof. Francesca Piqué, Scuola universitaria professionale della Svizzera italiana, Dipartimento ambiente costruzioni e design, Istituto materiali e costruzioni – SUPSI
- Dr Jana Sanyova, Institut Royal du Patrimoine Artistique – IRPA
- Julien Guéry, CAPTAIR company
The case study benefits from funding from the Regional Direction for Cultural Affairs (DRAC) of Burgundy.
Application of different imaging techniques on a teasel of one of the mural decoration of Germolles' palace. Macro-technical photography (a), Structured Light Imaging (b) and Reflectance Transformation Imaging (c), © Christian Degrigny, Germolles.