1. A method for sampling multi-spectral images of a dynamically changing scene, the method comprising the steps of: (a) deriving by use of a mosaic color photosensor a plurality of color separation sequences of images of the dynamically changing scene, wherein each of said plurality of color-separation sequences of images contains color-separation images corresponding to a distinct predefined color; (b) defining a subset of said color-separation sequences, said subset excluding at least one of said color separation sequences; (c) deriving a group of one or more of said color-separation images from said subset; (d) determining an exposure parameter by applying at least one exposure criterion to said group; such that said exposure parameter is determined based on said subset excluding at least one of said color separation sequences; and (e) adjusting said mosaic color photosensor to sample an image using an effective exposure setting, said effective exposure setting for said mosaic color photosensor being set in accordance with said exposure parameter.