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Heritage 2018, 1(2), 349-364; https://doi.org/10.3390/heritage1020024

Imaging Analysis and Digital Restoration of the Holy Face of Manoppello—Part II

1
Istituto di Cristallografia, Consiglio Nazionale delle Ricerche (IC-CNR), via Amendola 122/O, 70126 Bari, Italy
2
Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Piazza L. da Vinci, 32, 20133 Milano, Italy
3
Dipartimento di Ingegneria Industriale, via Gradenigo 6/a, Università di Padova, 35131 Padova, Italy
*
Author to whom correspondence should be addressed.
Received: 18 October 2018 / Revised: 3 November 2018 / Accepted: 15 November 2018 / Published: 18 November 2018
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Abstract

In this second work on the Holy Face of Manoppello, known also as the Veil, we have performed a spectral analysis of the transmitted image. Its thin linen threads are translucent, presumably because starched, allowing light to pass through them. As a result, the yellowish colour of the ancient linen and starch contribute substantially to the final hues of the Holy Face, especially when the Veil is lit from the backside with grazing light. Spectrophotometry measurements have allowed calculating how the fabric absorbs the various chromatic components. Through these quantitative evaluations, it has been possible to compensate the colours of the transmitted Holy Face image, by subtracting the contribution due to the yellowish coloration of the thin linen threads. Furthermore, the rotational spectrum of the image has been studied after digital restoration. The linear fit of the power spectrum in bi-logarithmic scale with a power law f P provided a slope parameter P = 3.49 ± 0.03 . This is a surprising value because it is typical of photographs of human faces, not of portraits of human faces painted by artists, which instead have statistical properties of fractal type, with values of slopes P = 2.0 . View Full-Text
Keywords: artwork; human face; optical characterization; photographs; portraits; Veil of Manoppello artwork; human face; optical characterization; photographs; portraits; Veil of Manoppello
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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De Caro, L.; Matricciani, E.; Fanti, G. Imaging Analysis and Digital Restoration of the Holy Face of Manoppello—Part II. Heritage 2018, 1, 349-364.

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