annaserotta Posted October 2, 2012 Report Share Posted October 2, 2012 Greetings RTI community! A colleague of mine is interested in documenting the surface of a 19th c. Japanese magic mirror. In general, such objects are cast in high tin bronze with a design (usually of a Buddha or inscription) on one side and a shiny smooth reflective mirror surface on the other side. When a strong light is shone on them they reflect the cast image from the back side onto a white wall. The overall reflective surface of these mirrors is slightly convex. The predominating theory on how these mirrors work is that there are slight inequalities in curvature, the thicker portions being slightly flatter than the thinner ones, and even sometimes actually concave. So, in theory, RTI should be able to show the image that is reflected because of these slight differences is concavity. We did two RTI captures the other day of this object, both of which show scratch marks in the mirror’s surface (from use, wear, etc.) but we were unable to see any of the slight inequalities in curvature that we were looking for. So either the surface features we’re looking for don’t exist, or the capture process is problematic. The surface is extremely shiny (it is, after all, a mirror) and we're wondering if anyone on this Forum has had success imaging something with similar surface qualities, and if so, is there anything we might do differently in the capture process to improve our data? We tried processing the data both as LRGB and RGB ptms and also as a RTI file with the HSH fitter--none of these gave us what we were looking for, and we still feel like we have incomplete data. Thanks! Anna Serotta Contract Conservator Sherman Fairchild Center for Objects Conservation The Metropolitan Museum of Art Link to comment Share on other sites More sharing options...
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