1. A computer-implemented method comprising: acquiring a first sequence of spectral images of an animal and unmixing the first sequence of spectral images into set of component images, wherein each component image shows a spatial distribution of a different component of the animal, and wherein each component has a unique spectral signature; displaying at least some of the component images; and providing a real-time display of updated component images, wherein providing the real-time display comprises: (a) acquiring and combining one or more additional spectral images of the animal with at least some of the previously acquired spectral images; (b) unmixing the combined spectral images into a new set of component images; (c) displaying at least some members of the new set of component images; and (d) repeating steps (a)-(c).