1. An image processing system configured to determine an intrinsic colour component of one or more objects for use in rendering the one or more objects, the image processing system being configured to receive one or more input images each representing a view of the one or more objects, wherein values of each of the one or more input images are separable into intrinsic colour estimates and corresponding shading estimates, the image processing system comprising: surface normal logic configured to determine a set of surface normals for the one or more objects of said one or more input images; global lighting determination logic configured to determine, in accordance with the values of the one or more input images and the determined set of surface normals, a global lighting estimate which provides consistent corresponding intrinsic colour estimates for a plurality of regions of the one or more objects from the one or more input images; and intrinsic colour determination logic configured to determine said intrinsic colour component, in accordance with the values of the one or more input images and the determined global lighting estimate; and a store configured to store: (i) the determined intrinsic colour component of the one or more objects, and (ii) the determined set of surface normals for the one or more objects, for use in rendering the one or more objects.