US Patent 7247421 Image forming method using photothermographic material

An image forming method using a photothermographic material including, on a support, at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent for silver ions, and a binder, wherein the photothermographic material includes at least two image forming layers having spectral sensitivities that are different from each other, and wherein the image forming method includes: imagewise exposing the photothermographic material by using at least two laser beams having wavelengths that are different from each other and correspond to photosensitive wavelengths of the image forming layers; and thermally developing the photothermographic material to form a fusion image made up of two or more kinds of image information. An image forming method using a photothermographic material which records a composite image made up of a silver image and a color image of different kinds of image information is provided.