A Learned Representation of Artist-Specific Colourisation

The colours used in a painting are determined by artists and the pigments at their disposal. Therefore, knowing who made the painting should help in determining which colours to hallucinate when given a colourless version of the painting. The main aim of this paper is to determine if we can create a colourisation model for paintings which generates artist-specific colourisations. Building on earlier work on natural-image colourisation, we propose a model capable of producing colourisations of paintings by incorporating a conditional normalisation scheme, i.e., conditional instance normalisation. The results indicate that a conditional normalisation scheme is beneficial to the performance. In addition, we compare the colourisations of our model that is trained on a large dataset of paintings, with those of competitive models trained on natural images and find that the painting-specific training is beneficial to the colourisation performance. Finally, we demonstrate the results of stylistic colour transfer experiments in which artist-specific colourisations are applied to the artworks of other artists. We conclude that painting colourisation is feasible and benefits from being trained on a dataset of paintings and from applying a conditional normalisation scheme.