Classical Inscription

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

Classical inscription version 1 with normals visualisation Classical inscription version 2 with normals visualisation

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 version 1 with specular enhancement Classical inscription version 2 with specular enhancement

Specular enhancement mathematically increases the image contrast, exaggerating the surface texture depth of the item. In the RTI viewer software, this effect is overlaid over the interactive image, meaning the light source is still moveable.



Classical Inscription


Classical Inscription Squeeze


Personal Collection


University of Exeter



Sample Owner

Charlotte Tupman

File Creator

Courtney Priday and Julia Hopkin


CC-BY Free Culture Licence

Format (1)

Reflectance Transformation Imaging file and associated views.

Format (2)



Paper Impression