An image forming method and device utilizes an imaging member to expose a photosensitive media to form a latent image on the media. The photosensitive media is of the type that comprises a plurality of microcapsules that encapsulate imaging material. The device and method of the present invention is adapted to utilize the application of pressure to create a compressive force on the media that is sufficient to rupture selected microcapsules in developing an image. In the arrangement of the present invention, a shim member arrangement is adapted to locate a thin member such as a plastic or film member over an imaging side of the media so as to protect the imaging side of the media during the application of pressure on the medium.