The use of non-invasive spectral measurements to control the conservation status is a part of the preventive conservation of artworks which nowadays is becoming increasingly interesting. This paper describes how to use a spectral measuring device and an illumination system specifically designed for such a task in a very large dimension artwork painting (7.8 m wide × 3.5 m high). The system, controlled by a Cartesian robot, allows spectral measurements in a spectral range of 400–780 nm. The measured data array has a total of 2201 circular regions with 5.5 mm spot diameter placed on a square grid. Colorimetric calculations performed from these spectral measurements may be used to characterize color shifts related to reflectance changes in specific areas of the paint. A color shifting from the expected gray has been shown.
P. Esteban Leal, B. Galán Martín, A. Losada Kuntz, P. Sedano Espín, P. Calopa, A. Iruretagoyena, J. García, R. Rubio, J. Sánchez, A. Rocha, C. Muro. “Estudio sobre el Estado de Conservación del Guernica de Picasso”. In: Museo Nacional Centro de Arte Reina Sofía, editor. Madrid, Spain: Museo Nacional Centro de Arte Reina Sofia, 1998.
2.
CIE 157:2004. “Control of Damage to Museum Objects by Optical Radiation”. Vienna, Austria: CIE Central Bureau, 2004.
3.
BacciM.CasiniA.CucciC.PicolloM.RadicatiB.VervatM.“Non-Invasive Spectroscopy Measurements on the Il Ritratto della Figliastra by Giovanni Fattori: Identification of Pigments and Colourimetric Analysis”. J. Cult. Herit. 2003. 4: 329–336.
4.
BacciM.BaldiniF.CarlàR.LinariR.PicolloM.RadicatiB.“Color Analysis of the Brancacci Chapel Frescoes: Part II”. Appl. Spectrosc. 1993. 47(4): 399–402.
5.
NorimichiT.YoichiM.VladimirB.“Spectral Color Imaging System for Estimating Spectral Reflectance of Paint”. J. Imaging Sci. Technol. 2007. 51(1): 70–78.
6.
HaneishiH.HasegawaT.HosoiA.YokoyamaY.TsumuraN.MiyakeY.“System Design for Accurately Estimating the Spectral Reflectance of Art Paintings”. Appl. Opt. 2000. 39(35): 6621–6632.
7.
J.E. Farrell, J. Cupitt, D. Saunders, B.A. Wandell, “Estimating Spectral Reflectances of Digital Artwork”. Chiba Conference of Multispectral Imaging, The Standford Center for Image Systems Engineering, Chiba, Tokyo, 1999.
8.
BernsR.S.“Exploring the Optical Properties of Picture Varnishes Using Imaging Techniques”. Stud. Conserv. 2003. 48(2): 73–82.
9.
R.S. Berns. “The Use of Multi-channel Visible Spectrum Imaging for Pigment Identification”. ICOM Committee for Conservation, 13th Triennial Meeting, Rio de Janeiro, 22--27 September 2002. Pp. 217--222.
10.
Y. Zhao, L. Taplin, M. Nezamabadi. “Using the Matrix R Method for Spectral Image Archives”. Association Internationale de la Couleur (AIC)-International Color Association Colour, 2005. Pp. 469–272.
11.
BacciM.MagriniD.PicolloM.VervatM.“A Study of the Blue Colors used by Telemaco Signorini (1835–1901)”. J. Cult. Herit. 2009. 10(2): 275–280.
12.
BernsR.S.“Designing White-Light LED Lighting for the Display of Art: A Feasibility Study”. Color Res. Appl. 2011. 36(5): 324–334.
13.
ZhaoY.BernsR.S.“Image-Based Spectral Reflectance Reconstruction Using the Matrix R Method”. Color Res. Appl. 2006. 32(5): 343–351.
14.
R.S. Berns. “Rejuvenating the Appearance of Cultural Heritage Using Color and Imaging Science Techniques”. AIC Colour 05, 10th Congress of the International Color Association, 2005.
15.
TuzikasA.ZukauskasA.VaicekauksasR.PetrulisA.VittaP.ShurM.“Artwork Visualization Using a Solid-state Lighting Wngine with Controlled Photochemical Safety”. Opt. Express. 2014. 22(14): 16802–16818.
16.
CastillejoM.“Effect of Wavelength on the Laser Cleaning of Polychromes on Wood”. J. Cult. Herit. Heritage. 2003. 4(3): 243–249.
17.
StaniforthS.“Retouching and Colour Matching: the Restorer and Metamerism”. Stud. Conserv. 1985. 30(3): 101–111.
18.
Y. Zhao, R. Berns, Y. Okumura, L.A. Lawrence. “Improvement of Spectral Imaging by Pigment Mapping”. 13th Color Imaging Conference Society for Imaging Science and Technology, Springfield, EEUU. 2005. 1: 40–45.
19.
DelaneyJ.K.“Visible and Infrared Imaging Spectroscopy of Picasso’s Harlequin Musician: Mapping and Identification of Artist Materials in Situ”. Appl. Spectrosc. 2010. 64(6): 584–594.
20.
MarengoE.“Development of a Technique based on Multi-spectral Imaging for Monitoring the Conservation of Cultural Heritage Objects”. Anal. Chim. Acta. 2011. 706(2): 229–237.
21.
BarontiS.“Multispectral Imaging System for the Mapping of Pigments in Works of Art by Use of Principal-Component Analysis”. Appl. Opt. 1998. 37(8): 1299–1309.
22.
BacciM.CasiniA.CucciaC.MuzziA.PorcinaiS.“A Study on a Set of Drawings by Parmigianino: Integration of Art-historical Analysis with Imaging Spectroscopy”. J. Cul. Herit. 2005. 6: 329–336.
CIE Publ. No. 159:2004. “A Colour Appearance Model for Colour Management Systems: CIECAM02”. Vienna, Austria: Commission Internationale de l’Eclairage, 2004.
