Photographic dye diffusion transfer process

Non-diffusible dye-providing compounds for the dye diffusion transfer process yielding color images of wanted absorption characteristics and improved light fastness correspond to the formula (A)n-P-N=N-B-(A)1-n IN WHICH A represents an oxidizable organic carrier residue which may be attached through a connecting member X and containing a group which confers diffusion resistance, from which carrier residue, either in its oxidized or in its unoxidized form, a part is split off together with the group which confers diffusion resistance under alkaline photographic development conditions, a diffusible azo dye represented by the formula P-N=N-B being released imagewise at the same time; P represents a monocyclic, carbocyclic aromatic group; B represents a bicyclic, carbocyclic aromatic group which carries a sulphonamide group in the p-position to the azo group; N=0 OR 1.