Stability of the color-opponent signals under changes of illuminant in natural scenes - Lovell, P. G. (University of Bristol. Department of Experimental Psychology) ; Tolhurst, D. J. (University of Cambridge. Department of Physiology) ; Parraga, Carlos Alejandro (University of Bristol. Department of Experimental Psychology) ; Baddeley, R. (University of Bristol. Department of Experimental Psychology) ; Leonards, U. (University of Bristol. Department of Experimental Psychology) ; Troscianko, J. (University of Oxford. Department of Zoology) ; Troscianko, Tom (University of Bristol. Department of Experimental Psychology)