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.
Reflectance Transformation Imaging can be carried out with a minimum of basic equipment. This view of a replica Early Medieval coin was created using a handheld LED torch and a DSLR camera on a horizontal-arm tripod, with a piece of string used to regulate the distance between torch and object. A 100mm macro lens was used to capture small features in greater detail.
A slight blurring effect is visible in the finished RTI, likely due to the torch not being held completely steady during photography, but the result still provides an enhanced view of many tiny details of this small object.
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.
Replica Early Medieval coin
University of Exeter
Julia Hopkin and Bronte Lyster
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Reflectance Transformation Imaging file and associated views.