This paper presents a method based on regression analysis for compositing colour images. The compositing process is carried out in a hierarchical fashion using two sets of images which form a Gaussian and a Laplacian pyramid. The method provides a gradual transition between composited images with minimum changes to the original data.
Binh Pham, "Compositing Colour Images" in Proc. IS&T 2nd Color and Imaging Conf., 1994, pp 183 - 185, https://doi.org/10.2352/CIC.1994.2.1.art00050