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Colour Change Measurement by Digital Image Processing

David Saunders
Technical Bulletin Volume 12, 1988


An image processing system is being used at the National Gallery, London, to record colour changes in paintings at five-year intervals. It is hoped that colour changes can be related to environmental conditions in areas where the paintings are stored or displayed. Techniques used in the past relied on photographic processes rather than optomechanical scanning which can make a permanent record of colour. The equipment of both the prototype system and the current system are described. The principles of digital imaging, the measurement procedure, and the limitations of the system are discussed.


colour, digital image processing, England (London), environmental conditions, equipment, paintings

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Saunders, D. 'Colour Change Measurement by Digital Image Processing'. National Gallery Technical Bulletin Vol 12, pp 66–77.

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