RTI is a method that captures how a complex material interacts with light—an important advance in our ability to investigate and monitor works of art that complements other imaging methods such as spectral imaging. While spectral imaging reports on surface phenomena, RTI provides information on the physical changes in the object itself as it reports on geometry. These changes include parchment cockling and distortion, movement of wood objects and flaking of stone, to name a few. All of these derive from changes in the complex surface geometry as measured by RTI.
To read more on our research using RTI data to track surface changes in paintings and drawings:
Download Measuring Changes in Cultural Heritage Objects with Reflectance Transformation Imaging
What is RTI?
Timelapse of RTI Capture
RTI Viewer Tutorial