The present invention provides a method for making direct-positive photographic images comprising the steps of image-wise exposing a photographic light-sensitive silver halide material comprising a support and at least one layer of an internal latent image-type silver halide emulsion, and developing said exposed photographic silver halide material in a surface developer in the presence of at least one development nucleator which is not able to react with nor adsorb on the surface of the silver halide emulsion crystals prior to development, but which contains a group protected against reaction with as well as against adsorption to silver halide which is transformed during development into a nucleating derivative with an enhanced reactivity for the surface of the silver halide crystals. Photographic materials comprising these novel development nucleators are also described.
本发明提供了一种制作直接正像摄影图像的方法,该方法包括以下步骤:从图像角度曝光感光卤化
银材料,该材料包括一个支撑物和至少一层内部潜像型卤化
银乳剂、在显影前,至少有一种显影成核剂不能与卤化
银乳剂晶体表面发生反应,也不能吸附在其表面,但它含有一个防止与卤化
银发生反应和吸附的基团,该基团在显影过程中转化为对卤化
银晶体表面具有更强反应性的成核衍
生物。此外,还介绍了包含这些新型显影成核剂的摄影材料。