  The last fifty years have seen an impressive development of mathematical
methods for the analysis and processing of digital images, mostly in the
context of photography, biomedical imaging and various forms of engineering.
The arts have been mostly overlooked in this process, apart from a few
exceptional works in the last ten years. With the rapid emergence of
digitisation in the arts, however, the arts domain is becoming increasingly
receptive to digital image processing methods and the importance of paying
attention to this therefore increases. In this paper we discuss a range of
mathematical methods for digital image restoration and digital visualisation
for illuminated manuscripts. The latter provide an interesting opportunity for
digital manipulation because they traditionally remain physically untouched. At
the same time they also serve as an example for the possibilities mathematics
and digital restoration offer as a generic and objective toolkit for the arts.
