Chapter 5 Hyperspectral Imaging: A New Technique for the Non-Invasive Study of Artworks

Abstract

Hyperspectral imaging generates an accurate digital record for art conservation. This may be used for monitoring change or damage to paintings, as digital documentation resists deterioration better than photographs. Also, digital imaging can assist in the restoration of artwork. It has already been applied to assessing damage from laser cleaning, where computer-aided comparison of before and after cleaning the images have provided superior results. Finally, digital imaging assists in discovering the history of a piece of art by revealing underdrawings and retouchings. Thus, multiple analysis objectives may be achieved simultaneously, which previously required several different instrumental techniques. A number of applications of this technique are given. In particular, studies of blue pigment in Sydney Nolan and Ivor Hele paintings will be described. The use of the technique to monitor the degradation of varnish on paintings is discussed.