Abstract
Infrared (IR) reflectography is an imaging diagnostic technique widely used to study and evaluate the assessment of paintings' conservation state. The study case analyzed in this paper is related to a polyptych panel attributed to Vivarini's workshop conserved in the “Sigismondo Castromediano” Museum in Lecce. The painting's IR reflectography has been acquired through a CCD camera with spectral sensitivity ranging 400–1150 nm and manual positioning system. In order to offset the technological limits of the CCD camera, reflectograms have been processed through Principal Component Analysis and spectral indices. Postprocessing provided information related to the different pictorial drafting and restoration works, as well as emphasized graphic details and shadings, useful to improve the knowledge of the painting techniques.
Highlights
As the photoreceptors of the human eye can “see” only in the “visible” spectrum, that is between 380 nm and 750 nm, they are able to detect only the reflected and diffused radiations coming from the most superficial pictorial layers of a painting
The INOA IR scanner is a modular device based on an optical head provided with InGaAs photodiode with spectral sensitivity up to 1700 nm and a lighting system which move together on a x-y precision translation stage, which makes it possible to take images at very high resolution (16 pixel points for mm2) without any geometrical distortion [7]. This kind of device has been employed in Italy to map what lays underdrawings and study the painting technique of Pietro Vannucci called “Il Perugino” [8, 9]
The IR reflectography of the painting has been acquired by a multispectral imaging system ARTIST, belonging to the Lecce Province Museum “Sigismondo Catromediano.”
Summary
As the photoreceptors of the human eye can “see” only in the “visible” spectrum, that is between 380 nm (blue) and 750 nm (red), they are able to detect only the reflected and diffused radiations coming from the most superficial pictorial layers of a painting. Solid state cameras with Indium GalliumAntimonide (InGaAs) and platinum silicide (PtSi) detectors are able to reach deeper layers due to their larger spectral sensitivity, ranging, respectively, from 0.9 to1.7 μm and from 1.2 to 5 μm Such cameras are very expensive and so their use is restricted to the study of paintings. The INOA IR scanner is a modular device based on an optical head provided with InGaAs photodiode with spectral sensitivity up to 1700 nm and a lighting system which move together on a x-y precision translation stage, which makes it possible to take images at very high resolution (16 pixel points for mm2) without any geometrical distortion [7] This kind of device has been employed in Italy to map what lays underdrawings and study the painting technique of Pietro Vannucci called “Il Perugino” [8, 9].
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