Reflectance Transformation Imaging

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Reflectance Transformation Imaging (RTI) is a computational photographic method that captures a subject’s surface shape and color and enables the interactive re-lighting of the subject from any direction.

Highlight RTI (H-RTI)

Dome RTI

Application in research


  • Multi-light Imaging Highlight-Reflectance Transformation Imaging (H-RTI) for Cultural Heritage:
  • M. Caine & M. Magen. Low cost heritage imaging techniques compared. Proceedings of the conference on Electronic Visualisation and the Arts (EVA ’17), pp. 430-437, London 2017. Available: https://10.14236/ewic/EVA2017.85.

Case Studies

  • M.T. Catalano. Nutzen und Grenzen der RTI-Fotografie am Beispiel von zwei stark beschädigten byzantinischen Bleisiegeln. Studies in Byzantine Sigillography, 14:147–157, 2022. Available: https://10.1484/M.SBS-EB.5.132253.
  • M.T. Catalano, M. Filosa & C. Sode. Byzantine seals from the Robert Feind collection in Cologne: research and publication in the context of the Digital Humanities. Revue des études byzantines 79:297-322, 2021. Available: https://10.2143/REB.79.0.3289649.
  • F. Fischer and S. Makowski. Digitalisierung von Siegeln Mittels Reflectance Transformation Imaging (RTI). Paginae Historiae, 25(1):137-141, 2017. Available:

Presentations and tutorials