Abstract

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.

System design for accurately estimating the spectral reflectance of art paintings

Hideaki Haneishi, Takayuki Hasegawa, Asako Hosoi, Yasuaki Yokoyama, Norimichi Tsumura, and Yoichi Miyake
Appl. Opt. 39(35) 6621-6632 (2000)

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W. M. Ruyten
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