Cultural and architectural heritage conservation and restoration : which colour ? / Marco Gaiani in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 44-55 Titre : Cultural and architectural heritage conservation and restoration : which colour ? Type de document : texte imprimé Auteurs : Marco Gaiani, Auteur ; Fabrizio Ivan Apollonio, Auteur ; Andrea Ballabeni, Auteur Année de publication : 2021 Article en page(s) : p. 44-55 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : Colours play a crucial role in the field of architectural heritage. Colour analysis and colour rendition are involved in several critical facets of heritage preservation, conservation and restoration. These aspects are related to accurate documentation and an accurate representation of heritage artefacts and architectural works. The aim of this paper is to describe critical issues and open problems of the processes involved in this field. Documentation is performed in multiple ways, acquiring heterogeneous data ranging from archival images, photographs, drawings using various consumer or professional instruments (eg, digital cameras and spectrophotometers). The reliability of colour acquisition might be influenced by instrumental reasons (the technology used to acquire colour information), by environmental changes (architectural heritage surveys are often performed outdoors), by morphology (complex architectural objects are characterised by concavities and convexities which complicate the reflection evaluation), or by materials (showing different reflection, porosity and transparency indexes). Identification of materials, such as colorants, pigments and dyes, is also a vital process in the heritage field. Colour information could be used as an approach to the identification of materials, but these methods are still under development, and many issues need to be solved to achieve reliable results. Visualisation techniques of a heritage artefact also present the problem of the correctness of the colour representation. Several problems need to be faced in this context: the reliability of the acquisition, colour management of the rendering software, model complexity, and fragmentation of the devices upon which the model is visualised. Note de contenu : - ARCHITECTURAL HERITAGE AND "open air" ARCHAEOLOGY COLOUR DOCUMENTATION : The general problem - Colour documentation using instruments - Colour documentation using images - Colour appearance : identification and visualisation - MATERIAL COLOUR IDENTIFICATION AND DECAY ANALYSIS USING COLOUR : The material colour and decay analysis general problem - The case of drawings : colour analyses - The case of metal-point identification in the Leonardo da Vinci drawings - The case of the use of multispectral analysis to support restorer activity - THE TARGET-BASED "COLOUR CHARACTERISATION PROBLEM" : An overview - The target selection problem - Target use-related problems - The δE formula problem - The reference conditions problem to measure colour reproduction accuracy - The assumptions of the CIE system limit in the heritage field - 3D MODEL COLOUR ACQUISITION, MANAGEMENT AND VISUALISATION PROBLEMS : Overview of the surface perception digital visualisation background - 3D model colour acquisition technique limits - 3D model colour management limits - The colour space selection problem - The BRDF representation and visualisation problem - The observer environment problem DOI : 10.1111/cote.12499 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12499 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35588 [article]

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