The present inventors arrived at this trade off after inspecting results on a validation dataset with the aim of producing the minimum number of alphas while making sure that the color sail rig represents the image sufficiently.
Thus, in this embodiment, the system 100 determines alpha masks, color sails, and a pixel to color sail mapping. The user can now edit or amend one of several linked color sails to recolor distinct regions of the image. The reconstructed pixel is computed using Eq. (9). This allows fast exploration of widely different color combination for various regions of the image.