Towards colour-accurate documentation of anonymous expressions

Conference paper

Adolfo Molada-Tebar, Geert J. Verhoeven
Geert J. Verhoeven, Jona Schlegel, Benjamin Wild, Stefan Wogrin, Massimiliano Carloni, document | archive | disseminate graffiti-scapes. Proceedings of the goINDIGO 2022 international graffiti symposium, Urban Creativity, Lisbon, 2023, pp. 86-130

DOI: 10.48619/indigo.v0i0.704

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APA Click to copy
Molada-Tebar, A., & Verhoeven, G. J. (2023). Towards colour-accurate documentation of anonymous expressions. In G. J. Verhoeven, J. Schlegel, B. Wild, S. Wogrin, & M. Carloni (Eds.), document | archive | disseminate graffiti-scapes. Proceedings of the goINDIGO 2022 international graffiti symposium (pp. 86–130). Lisbon: Urban Creativity. https://doi.org/10.48619/indigo.v0i0.704

Chicago/Turabian Click to copy
Molada-Tebar, Adolfo, and Geert J. Verhoeven. “Towards Colour-Accurate Documentation of Anonymous Expressions.” In Document | Archive | Disseminate Graffiti-Scapes. Proceedings of the GoINDIGO 2022 International Graffiti Symposium, edited by Geert J. Verhoeven, Jona Schlegel, Benjamin Wild, Stefan Wogrin, and Massimiliano Carloni, 86–130. Lisbon: Urban Creativity, 2023.

MLA Click to copy
Molada-Tebar, Adolfo, and Geert J. Verhoeven. “Towards Colour-Accurate Documentation of Anonymous Expressions.” Document | Archive | Disseminate Graffiti-Scapes. Proceedings of the GoINDIGO 2022 International Graffiti Symposium, edited by Geert J. Verhoeven et al., Urban Creativity, 2023, pp. 86–130, doi:10.48619/indigo.v0i0.704.

BibTeX Click to copy

@inproceedings{molada-tebar2023a,
  title = {Towards colour-accurate documentation of anonymous expressions},
  year = {2023},
  address = {Lisbon},
  pages = {86-130},
  publisher = {Urban Creativity},
  doi = {10.48619/indigo.v0i0.704},
  author = {Molada-Tebar, Adolfo and Verhoeven, Geert J.},
  editor = {Verhoeven, Geert J. and Schlegel, Jona and Wild, Benjamin and Wogrin, Stefan and Carloni, Massimiliano},
  booktitle = {document | archive | disseminate graffiti-scapes. Proceedings of the goINDIGO 2022 international graffiti symposium}
}

Abstract
Colour is a powerful communication element in most forms of cultural heritage. This importance of colour notwithstanding, the documentation of cultural heritage typically captures the geometrical aspects and seldom the spectral dimensions of an artefact. This is partly because the science of colour (called colorimetry) is non-trivial. In addition, capturing accurate colour data with digital cameras remains challenging due to the operating principle of standard imaging sensors and the need for a stable and well-characterised illumination source. Despite these limitations, the heritage science project INDIGO made it one of its central aims to generate colour-accurate photos from graffiti captured with standard digital cameras in varying outdoor illumination conditions. This paper first discusses the importance of colour accuracy in graffiti documentation. Afterwards, the text details (in a non-mathematical manner) essential colorimetric and camera principles that underlie the generation of colour images from raw image sensor data. This in-depth coverage supports clarifying the main hurdles to accurate photo colours. Finally, the paper introduces the open-source COOLPI software resulting from this research. We are confident that COOLPI will benefit any other heritage documentation project, or any application where digital cameras play a fundamental role in acquiring correct colour values.

Geert J. Verhoeven

Towards colour-accurate documentation of anonymous expressions

Conference paper

Cite

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