申请人:AGFA-GEVAERT
naamloze vennootschap
公开号:EP0634692A1
公开(公告)日:1995-01-18
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 a layer of an internal latent image-type silver halide emulsion the pAg of which has been adjusted to a value of at least 8.5 before coating, 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 but which is able to adsorb weakly on the surface of the silver halide emulsion crystals prior to development, but which contains a group protected against reaction with silver halide and which is transformed during development in a nucleating derivative with an enhanced reactivity for 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:在涂布前,将感光卤化银材料按图像顺序曝光,该材料包括一个支撑物和一层内部潜像型卤化银乳剂,其pAg值至少调整到8.该显影剂在显影前不能与卤化银乳剂晶体表面发生反应,但能微弱地吸附在其表面,但含有一个防止与卤化银发生反应的基团,并在显影过程中转化为对卤化银晶体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。