To change the light direction, click the lightbulb button on the left of the viewer, and click and drag over the viewer with the mouse. Click the question mark button for more guidance on using the viewer.
These RTIs (Reflectance Transformation Images) show a paper impression or ‘squeeze’ of a classical stone inscription, created by pressing wet paper into the letters of the inscription. Digitising it using RTI enables the viewer to appreciate the three-dimensional nature of the squeeze, and investigate details such as the engraving methods used in the inscription. While the intention of this RTI was to investigate the squeeze, RTI could also be used to capture the original inscription itself, potentially providing different information.
Examples of Visual Effects in RTI Viewer
Normals visualisation creates a false colour image with each pixel’s ‘surface normal’ direction mapped to a colour palette - indicating which direction each surface is facing.
Classical Inscription Squeeze
University of Exeter
Courtney Priday and Julia Hopkin
CC-BY Free Culture Licence
Reflectance Transformation Imaging file and associated views.