The present invention provides a photographic element comprising a dimensionally stable hydrophobic transparent polyester film support, at least one light-sensitive silver halide emulsion layer, and at the side of said support opposite to that of said emulsion layer(s), a subbing layer essentially consisting of poly-N-vinyl pyrrolidone, and an antihalation layer comprising carbon black dispersed in a water-insoluble alkali-soluble copolymer of 1 to 65% by weight of a C.sub.1 -C.sub.4 alkyl methacrylate, 10 to 79% by weight of a C.sub.1 -C.sub.8 alkyl acrylate, and 10 to 50% by weight of acrylic acid or methacrylic acid. The present invention also provides a process of manufacturing a dimensionally stable hydrophobic transparent polyester film support carrying a subbing layer and an alkali-soluble carbon black antihalation layer, said process comprising monoaxially stretching an extruded amorphous polyester film, coating it with an aqueous solution of poly-N-vinyl pyrrolidone to form said subbing layer, drying it, stretching it together with said film in a direction perpendicular to that of the first stretching, heat-setting, coating the film support with an aqueous dispersion of carbon black in said above-mentioned water-insoluble alkali-soluble copolymer to form said alkali-soluble antihalation layer.