Christian Degrigny is currently Professor at Haute Ecole Arc Conservation-restauration (HE-Arc CR). Trained as an electrochemist, he obtained his PhD in analytical chemistry from the University of Paris VI in 1990 and specialised in the application of electrochemical techniques in metal conservation. He worked as a Conservation Scientist in France (1991–2001), Director of studies for a conservation programme in Finland (2001–2002) and Director of a diagnostic laboratory at the Malta Centre for Restoration (2003–2005). These various professional experiences have given him a broad understanding of the imaging techniques commonly used in conservation, enabled him to teach them, and sparked his interest in more innovative methods as well.Sony George is Professor of Spectral Imaging at the Colourlab, Department of Computer Science, NTNU - Norwegian University of Science and Technology. He has been an active member at various roles in different EU projects and COST actions related to the field of cultural heritage documentation and analysis. His expertise includes multi‑hyperspectral imaging, computer vision, image quality, etc. He is a member of professional societies IEEE, ACM, and SPIE. Before joining NTNU, he worked as a Researcher at Gjøvik University College, Norway.Jon Yngve Hardeberg is Professor of Colour Imaging at the Colourlab at NTNU ‑ Norwegian University of Science and Technology. His research interests include spectral imaging, image quality, material appearance, and cultural heritage imaging, and he has co‑authored over 400 publications. He has coordinated three European MSCA ITN projects (CP7.0, ApPEARS, CHANGE) and started three companies, Artikolor AS, Spektralion AS, and Safe Media AI AS, to develop, apply, and disseminate knowledge and tools in art history, colour science, spectral imaging, and artificial intelligence. He is a Fellow of the IS&T, Senior Member ofSPIE and IEEE, and member of Optica, ACM, and ICOM. He is the Norwegian delegate to Division 8 of the CIE (International Commission on Illumination), and founder and board member of Forum Farge, Norway’s member association in AIC ‑ International Colour Association.

• List of figures and tables; 1 Introduction; 2 Change in conservation and conservation science; 3 Spectral imaging for cultural heritage documentation and analysis; 4 Appearance and multi-angle imaging; 5 3D imaging; 6 A discussion on some methodological aspects in the study of metal soaps on painted metals; 7 From lab to in-situ approaches: applications of hyperspectral imaging to stained-glass windows; 8 Quality evaluation in cultural heritage digitization; 9 Application of hyperspectral imaging for characterization of corrosion for 2.5D and 3D model glass; 10 A multimodal methodology for pigment identification in artworks; 11 Arte-Profiler: An open-source tool for color profiling and accuracy assessment in cultural heritage photography; 12 Challenges in RTI data acquisition; 13 Quantifying the appearance of water gilding, oil gilding, and yellow glazed water silvering; 14 Automated 3D registration techniques for applications in cultural heritage monitoring; 15 Identification of geometry changes from cultural heritage surfaces; 16 3D digital image correlation method for spatio-temporal monitoring of parchments; Conclusions; Index.

Christian Degrigny is currently Professor at Haute Ecole Arc Conservation-restauration (HE-Arc CR). Trained as an electrochemist, he obtained his PhD in analytical chemistry from the University of Paris VI in 1990 and specialised in the application of electrochemical techniques in metal conservation. He worked as a Conservation Scientist in France (1991–2001), Director of studies for a conservation programme in Finland (2001–2002) and Director of a diagnostic laboratory at the Malta Centre for Restoration (2003–2005). These various professional experiences have given him a broad understanding of the imaging techniques commonly used in conservation, enabled him to teach them, and sparked his interest in more innovative methods as well.Sony George is Professor of Spectral Imaging at the Colourlab, Department of Computer Science, NTNU - Norwegian University of Science and Technology. He has been an active member at various roles in different EU projects and COST actions related to the field of cultural heritage documentation and analysis. His expertise includes multi‑hyperspectral imaging, computer vision, image quality, etc. He is a member of professional societies IEEE, ACM, and SPIE. Before joining NTNU, he worked as a Researcher at Gjøvik University College, Norway.Jon Yngve Hardeberg is Professor of Colour Imaging at the Colourlab at NTNU ‑ Norwegian University of Science and Technology. His research interests include spectral imaging, image quality, material appearance, and cultural heritage imaging, and he has co‑authored over 400 publications. He has coordinated three European MSCA ITN projects (CP7.0, ApPEARS, CHANGE) and started three companies, Artikolor AS, Spektralion AS, and Safe Media AI AS, to develop, apply, and disseminate knowledge and tools in art history, colour science, spectral imaging, and artificial intelligence. He is a Fellow of the IS&T, Senior Member ofSPIE and IEEE, and member of Optica, ACM, and ICOM. He is the Norwegian delegate to Division 8 of the CIE (International Commission on Illumination), and founder and board member of Forum Farge, Norway’s member association in AIC ‑ International Colour Association.

• List of figures and tables; 1 Introduction; 2 Change in conservation and conservation science; 3 Spectral imaging for cultural heritage documentation and analysis; 4 Appearance and multi-angle imaging; 5 3D imaging; 6 A discussion on some methodological aspects in the study of metal soaps on painted metals; 7 From lab to in-situ approaches: applications of hyperspectral imaging to stained-glass windows; 8 Quality evaluation in cultural heritage digitization; 9 Application of hyperspectral imaging for characterization of corrosion for 2.5D and 3D model glass; 10 A multimodal methodology for pigment identification in artworks; 11 Arte-Profiler: An open-source tool for color profiling and accuracy assessment in cultural heritage photography; 12 Challenges in RTI data acquisition; 13 Quantifying the appearance of water gilding, oil gilding, and yellow glazed water silvering; 14 Automated 3D registration techniques for applications in cultural heritage monitoring; 15 Identification of geometry changes from cultural heritage surfaces; 16 3D digital image correlation method for spatio-temporal monitoring of parchments; Conclusions; Index.