Abstract: Processing apparatus for developing exposed film by sequentially subjecting an emulsion side of the film to processing liquids. The processor has an elongate, horizontally disposed tank divided into a plurality of serially arranged compartments for holding the liquid. The film emulsion side faces downwardly and passes over a nozzle plate disposed between the film and a drainage opening for each compartment which forms a processing liquid curtain that contacts every part of the film's emulsion side. A cover plate on top of the film guides the film and includes longitudinally extending pressure-relieving grooves to prevent the film from adhering to the plate. The drainage opening for each compartment is slanted and a processing fluid return line guides the fluid from the compartment to a collection point for recirculation. The return conduit has a sufficiently large diameter so that the returning liquid does not fill the complete cross-section of the conduit.