Photographic dye diffusion transfer process

Photographic dye diffusion transfer process for the production of coloured images, in which a photographic material having at least one light-sensitive silver halide emulsion layer and a non-diffusible dye-providing compound associated with this layer is exposed imagewise and developed with a silver halide developer, a diffusible dye being released imagewise from the non-diffusible dye-providing compound under alkaline photographic development conditions transferred to an image receptor layer, in which the non-diffusible dye providing compound used is a compound corresponding to the following formula I:

• ##STR15## in which A.sup.1 represents an oxidizable organic carrier residue containing a group which confers diffusion resistance, from which residue, either in its oxidized or in its unoxidized form, at least a part thereof together with the group which confers diffusion resistance is split off under alkaline photographic development conditions and at the same time a diffusible azo dye is released imagewise;
• D represents a heterocyclic or carbocyclic aromatic group;
• R.sup.1 represents hydrogen or an alkyl, aralkyl or aryl group
• R.sup.2 and R.sup.3, which may be the same or different, each represents one of the groups mentioned under R.sup.1, sulpho, --COOR.sup.4, halogen, trihalogenmethyl, acylamino, acyloxy, carbamoyl, sulphamoyl, --OR.sup.4 --, SR.sup.4, --SOR.sup.4, --SO.sub.2 --R.sup.4, in which R.sup.4 has one of the meanings specified for R.sup.1, --NO.sub.2 or --CN;
• l, m and n each represents 0 or 1 such that l+m+n=1;
• and
• r represents an integer of from 1 to 4.