Versão em português
N.º 34
2020
pp. 50-64

 

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Article
Chromatic changes in paintings of Adriano de Sousa Lopes after the removal of aged varnish

João Linhares1,, Liliana Cardeira2,3 , Ana Bailão2,4 , Ruben Pastilha1 , Sérgio Nascimento1 

1 Universidade do Minho, Centro de Física, Laboratório de Ciências da Cor, Campus de Gualtar, Gualtar, 4710-057 Braga, Portugal

2 CIEBA, Faculdade de Belas-Artes da Universidade de Lisboa, Largo da Academia Nacional de Belas-Artes, nº4, 1249-058 Lisboa, Portugal

3 Laboratório HERCULES, Universidade de Évora, Palácio do Vimioso nº 8, 7000-809 Évora, Portugal

4 CITAR, Universidade Católica Portuguesa, Rua Diogo Botelho, nº 1327, 4169-005 Porto, Portugal

* jlinhares@fisica.uminho.pt

Abstract

The ability to digitally remove the varnish layer during the pre-conservation diagnostic of a painting, without any chemical or physical intervention, could be an advantage because it enables the prediction of the outcome of the cleaning procedure of the protective layer and contributes to the treatment proposal. Two paintings from Adriano de Sousa Lopes were investigated by hyperspectral imaging in the visible range, before and after the varnish layer removal. The spectral reflectance was estimated in each case and its comparison used to assess the effect of the varnish layer removal. The simulated paintings with the old varnish layer were compared with those restored, with no varnish, by comparing the chromaticity coordinates and other chromatic descriptors. It was found that considering the effect of the varnish layer of each painting individually produces lower errors than considering the average of the varnish layer across paintings. It was also found that simulating the varnish layer removal without knowing the varnish transmittance produces limited results and that the errors are smaller if the chromatic content is assessed without considering lightness.

Keywords

Colours
Varnish layer
Paintings
Hyperspectral imaging
Spectral analysis
Digital removal

Language

English

DOI

10.14568/cp2018064

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Citation

Conservar Património | APA | Chicago | NP405 | ABNT

Conservar Património:
Linhares, J.; Cardeira, L.; Bailão, A.; Pastilha, R.; Nascimento, S., 'Chromatic changes in paintings of Adriano de Sousa Lopes after the removal of aged varnish', Conservar Património 34 (2020) 50-64, https://doi.org/10.14568/cp2018064.

APA:
Linhares, J., Cardeira, L., Bailão, A., Pastilha, R., & Nascimento, S. (2020). Chromatic changes in paintings of Adriano de Sousa Lopes after the removal of aged varnish. Conservar Património, 34 50-64. DOI:10.14568/cp2018064.

Chicago:
Linhares, João, Liliana Cardeira, Ana Bailão, Ruben Pastilha, and Sérgio Nascimento. 2020. "Chromatic changes in paintings of Adriano de Sousa Lopes after the removal of aged varnish." Conservar Património 34:50-64. doi:10.14568/cp2018064.

NP405:
LINHARES, João [et al.] – Chromatic changes in paintings of Adriano de Sousa Lopes after the removal of aged varnish. Conservar Património. [Em linha]. 34 (2020) 50-64 [Consult. ]. Disponível em WWW: <URL:https://doi.org/10.14568/cp2018064>. ISSN 21829942.

ABNT:
LINHARES, João et al. Chromatic changes in paintings of Adriano de Sousa Lopes after the removal of aged varnish. Conservar Património, Lisboa, v. 34, p. 50-64, 2020. Disponível em: <https://doi.org/10.14568/cp2018064>. Acesso em: .

History

Received: 2018-12-8
Revised: 2019-4-8
Accepted: 2019-4-29
Online: 2020-7-31

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Stable url: https://doi.org/10.14568/cp2018064

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