To move the light position in the interactive RTI, make sure the lightbulb icon in the bottom right corner is highlighted rather than dark then click and drag across the viewer.
To pan around the image, turn the lightbulb icon off, and click and drag across the viewer.
Use the layers icon to enable enhanced views of the RTI, including diffuse and specular (mathematical enhancements that remove colour and increase contrast), and normals (a false-coloured static view of the surface profile).
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.