Digital imaging methods for painting analysis: the application of RTI and 3D scanning to the study of brushstrokes and p
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Digital imaging methods for painting analysis: the application of RTI and 3D scanning to the study of brushstrokes and paintings Jihyun Min 1 & Jaehong Ahn 2 & Sohyun Ahn 1 & Heesu Choi 1 & Sangdoo Ahn 1,3 Received: 23 August 2019 / Revised: 26 May 2020 / Accepted: 24 June 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
This work presents digital imaging technology as a tool for studying artists’ brushstroke patterns and painting techniques. Digital imaging analysis performed using reflectance transformation imaging (RTI) and three-dimensional (3D) scanning was used to observe the morphological textures of brushstrokes formed on the painted surface; this provided a “digital fingerprint” to indicate an individual artist’s specific characteristics. A model specimen was produced to examine the relationship between paint and painting tools. For painting tools, twelve types of brushes were chosen from the artist’s studio. The results revealed distinctive features among the different types of brushes. The model specimen was then further compared with the artist’s works and a replicated painting was also produced for comparison with one of the original works. The overall result provided information about similar patterns corresponding to the types of brushes the artist used for the model specimen and paintings. Distinctive painting pattern features were detected in the replica, although it was painted using the same material and type of brush. Keywords Brushstroke . Painting analysis . Reflectance transformation imaging . 3D scanning
1 Introduction A painting can be studied by examining a variety of characteristics that are expressed in the work. Specifically, a well-trained eye can examine artistic methods or elements that are expressed through brushwork, such as color, perspective, preferred themes, or techniques.
* Sangdoo Ahn [email protected]
1
Department of Science of Cultural Properties, Chung-Ang University, Seoul 06974, South Korea
2
Graduate School of Culture Technology, KAIST, Daejeon 34141, South Korea
3
Department of Chemistry, Chung-Ang University, Seoul 06974, South Korea
Multimedia Tools and Applications
Among these features, brushwork, which is a characteristic stroke made by the artist, can serve as a fingerprint for ascertaining originality. However, a naked-eye examination is limited in its ability to accurately confirm artistic features due to the different levels of expertise and knowledge of the individuals who are inspecting the work, thus making it difficult to exercise objective judgement. In addition, due to the limitations of human eyesight and the distortion of light, some features of the works are difficult to visualize. In this respect, this study aims to combine reflectance transformation imaging (RTI) and three-dimensional (3D) scanning to confirm the resultant method’s effectiveness for examining paintings. RTI is a well-known non-invasive surface examination technique that is used for obtaining detailed information about geometry and morpho
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