Recoding Color Transfer as A Color Homography

The recently discovered color homography theorem proves that colors across a change in photometric viewing condition are related by a homography [2]. In this paper, we propose a color-homography-based color transfer decomposition which encodes color transfer as a combination of chromaticity shift and shading adjustment. Our experiments show that the proposed color transfer decomposition provides a very close approximation to many popular color transfer methods. We believe that our color transfer model is useful and fundamental for developing simple and efficient color transfer algorithms. Our model also enables users to amend the imperfections of a color transfer result or extract a concise form of the original desired effect (which allows a more efficient re-application of the original color transfer).