| 摘要 |
Images are formed on direct positive photographic material in a single white-light exposure through the use of a master sheet which consists essentially of a selectively transmissive filter layer which allows transmission only of longer wave length light which is effective in reversing the prefogged direct positive material, and indicia disposed with respect to the filter layer to form in the master substantially totally opaque elements and substantially totally white light transmissive elements. Normal photographic development of the direct positive material after exposure provides positive images of equal intensity corresponding to the opaque and transparent indicia elements.
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