(57) A color diffusion transfer photographic film unit, comprising a support which is rendered light-­shielding and light-reflective on and/or in the support, provided a photosensitive element containing (a) a layer having a neutralizing function, (b) a dye image receiving layer, (c) a peeling layer, and (d) at least one silver halide emulsion layer associated with at least one dye image forming substance, an alkali processing composition containing a light shielding agent, and a transparent cover sheet, wherein said cover sheet contains a dye trapping layer. The film unit can be quickly processed in a light room, possesses excellent handling properties and provides high quality color prints which can be viewed without having to look through a support.