The infrared reflectogram (IRR)
systems, only a small area can be studied
at a time with IRR. To examine an entire
painting, the infrared camera has to be
moved across its surface. To document
an underdrawing, the individual close-up
IRRs are captured by taking photographs
of the television monitor. The image at
left displays six infrared reflectograms
from Portrait of a Man.
Overlapping individual images can then be pasted together in a kind of mosaic, the IRR-assembly. The analog signal from the infrared camera can also be captured as digital data, which can then be assembled on the computer using specialized software.
Click here here to compare an infrared reflectogram of Portrait of a Man with a visible light image of the same painting. (Requires the most current shockwave plug-in.)
Continue.