Practical RGB-to-XYZ Color Transformation Matrix Estimation under Different Lighting Conditions for Graffiti Documentation

Journal article

Adolfo Molada-Tebar, Geert J. Verhoeven, David Hernández-López, Diego González-Aguilera
Sensors, vol. 24(6), MDPI, 2024, p. 1743

DOI: 10.3390/s24061743

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APA Click to copy
Molada-Tebar, A., Verhoeven, G. J., Hernández-López, D., & González-Aguilera, D. (2024). Practical RGB-to-XYZ Color Transformation Matrix Estimation under Different Lighting Conditions for Graffiti Documentation. Sensors, 24(6), 1743. https://doi.org/10.3390/s24061743

Chicago/Turabian Click to copy
Molada-Tebar, Adolfo, Geert J. Verhoeven, David Hernández-López, and Diego González-Aguilera. “Practical RGB-to-XYZ Color Transformation Matrix Estimation under Different Lighting Conditions for Graffiti Documentation.” Sensors 24, no. 6 (2024): 1743.

MLA Click to copy
Molada-Tebar, Adolfo, et al. “Practical RGB-to-XYZ Color Transformation Matrix Estimation under Different Lighting Conditions for Graffiti Documentation.” Sensors, vol. 24, no. 6, MDPI, 2024, p. 1743, doi:10.3390/s24061743.

BibTeX Click to copy

@article{molada-tebar2024a,
  title = {Practical RGB-to-XYZ Color Transformation Matrix Estimation under Different Lighting Conditions for Graffiti Documentation},
  year = {2024},
  issue = {6},
  journal = {Sensors},
  pages = {1743},
  publisher = {MDPI},
  volume = {24},
  doi = {10.3390/s24061743},
  author = {Molada-Tebar, Adolfo and Verhoeven, Geert J. and Hernández-López, David and González-Aguilera, Diego}
}

Abstract
Color data are often required for cultural heritage documentation. These data are typically acquired via standard digital cameras since they facilitate a quick and cost-effective way to extract RGB values from photos. However, cameras’ absolute sensor responses are device-dependent and thus not colorimetric. One way to still achieve relatively accurate color data is via camera characterization, a procedure which computes a bespoke RGB-to-XYZ matrix to transform camera-dependent RGB values into the device-independent CIE XYZ color space. This article applies and assesses camera characterization techniques in heritage documentation, particularly graffiti photographed in the academic project INDIGO. To this end, this paper presents COOLPI (COlor Operations Library for Processing Images), a novel Python-based toolbox for colorimetric and spectral work, including white-point-preserving camera characterization from photos captured under diverse, real-world lighting conditions. The results highlight the colorimetric accuracy achievable through COOLPI’s color-processing pipelines, affirming their suitability for heritage documentation.

Geert J. Verhoeven

Practical RGB-to-XYZ Color Transformation Matrix Estimation under Different Lighting Conditions for Graffiti Documentation

Journal article

Cite

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