RTI is a dynamic surface imaging technique, and while I've got static photos and links to information sources up already, I don't have a good demonstration of the system and results handy on this site. So I've created a few short videos, embedded below, to show off how the system actually works, and what kind of results you can get. Hopefully, they'll make the technique, and the system I'm documenting here, clearer. There's a lot more info, including more videos, at my RTI for Lithics site, including RTI data files you can download and play with.

The first video shows an earlier prototype RTI system; the one I'm documenting here will be a bit more sophisticated, but operation and results should be very similar.

Next is a closeup of the camera screen while the system is in action, showing the LEDs turning on and off, and the camera being fired in synch with the LEDs at different lighting angles.

Here's a montage of all 48 photos taken of the sample artifact (a modern replica obsidian arrowhead) during the RTI dome system imaging run shown above; each photo was taken with a different LED lighting angle, and the camera in a fixed position looking straight down at the object:

These 48 photos are processed using free software into an RTI data file, which can then be interactively viewed and manipulated using the free RTIViewer software (available at the Cultural Heritage Imaging website). Here's a quick video demo of some of its features: