Multi-light Imaging for Heritage Applications

By Sarah Duffy, Paul Bryan, Graeme Earl, Gareth Beale, Hembo Pagi and Eleni Kotouala

This publication provides practical guidance on reflectance transformation imaging (RTI), an innovative multi-light imaging technique, and in particular, on the polynomial texture mapping (PTM) method for fitting reflectance distribution data. It aims specifically to offer user-friendly guidelines and advice for using the highlight-RTI (H-RTI) capture method, a flexible and low-cost RTI recording approach.

Although these guidelines focus on H-RTI, an alternative recording technique that utilises a pre-fabricated dome will also be introduced, so that readers are able to decide which capture method is most appropriate for their recording project. Several case studies demonstrate how the technology can be used to understand better the cultural heritage we record. These practical examples provide solutions to some of the common challenges encountered in using this recording approach.


1 Introduction
2 Highlight-RTI capture technique
3 Post-processing the H-RTI
4 An alternative recording approach and software innovations
5 Viewing RTI and PTM files
6 Alternative RTI formats and emerging software
Glossary and abbreviations
Web links cited
Case Studies

Additional Information

  • Series: Guidance
  • Publication Status: Completed
  • Product Code: 51802
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