Abstract: A method and apparatus are disclosed whereby generally matched exposures for at least first and second photoresponsive materials generally concurrently can be obtained, wherein the first photoresponsive material is more photoresponsive than the second.

Abstract: An improved electronic still imaging camera is described wherein electronic voltage values representative of an image are transformed according to an optimum tone scale mapping gamma curve. The gamma curve utilizes a subjective element along with an element associated with scene reflectivity to optimize tone scale variations according to steps in an analog-to-digital converter while reducing contouring in the image.

Abstract: The present invention is directed to a color diffusion transfer film unit comprising a transparent support carrying on a first side at least a first photosensitive silver halide emulsion layer having dye image-providing material associated therewith, a substantially opaque layer, a reflective layer and a dye image-receiving layer; said transparent support carrying on a second side a layer initially transparent to radiation actinic to said silver halide emulsion, said initially transparent layer adapted to convert an opaque layer upon contact with alkali which prevents transmission of exposing radiation to said silver halide emulsion layer wherein said photosensitive silver halide emulsion layer is intermediate said initially transparent layer and said opaque layer.

Abstract: An image-receiving element for use in a diffusion transfer process comprising a transparent support carrying an image-receiving layer and a hydrogel comprising a hydrophilic polymer layer cross-linked by ionizing radiation, said polymer layer containing aqueous alkaline photographic processing composition.