IRR RTI using the Osiris


After many months of waiting the new Osiris IRR camera/scanner from Opus Instruments finally arrived. We acquired a few test scans of paintings and test panels around the studio and turned to the long outstanding question of using Reflectance Transformation Imaging in the Infra Red. First a normal RTI using the flash unit in the studio and a digital SLR was obtained.

Default                                                                 Specular Enhancement

Not surprisingly one could study the surface and texture of paint, canvas, craquelure, in-fills and conservation in-painting.

Here is a movie of real time view/manipulation within the RTI/PTM viewer (first half in Default and second under Specular Enhancement)

Next a UV RTI took but an hour – sorry we are having some difficulties with the finished RTI so here is just a still

And finally the IRR RTI which took us a full day. Each scan takes about 15 minutes and thus one must have a ‘stationary’ studio light.

The results were worth the wait.

Default                                                                 Specular Enhancement

See a movie of manipulation within the RTI/PTM viewer (first half in Default and second under Specular Enhancement)

The IR sensor sensitive from 900 to 1700 nm in combination  with the RTI technique is able to compliment VL and UV RTIs and provide us with additional information on under-painting, under-drawing, new and old repairs and their sequence, and some ‘textural’ information not otherwise available. The RTI IRR has a tremendous potential for fine art conservation and historical investigations.

More tests to come…

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Filed under IRR, Research, RTI, Studio Work

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