*2.3. Photometric Stereo Imaging*

All three prints were imaged with a photometric stereo dome that is constructed of 81 LEDs, mounted at regular intervals on the concave interior of a hemispherical dome [26]. The prints were placed under the dome and illuminated with each LED in sequence while one photograph was captured for each incident lighting angle. Captures were made with a Canon EOS 50 Mark III DSLR fitted with a 20 mm prime lens. Data were processed using the near lighting model described in [26] and using open source software provided therein to produce three-dimensional false color maps indicating the orientation of the prints' surface (i.e., normal maps).
