发明名称 |
Process for the production of direct-positive photographic images |
摘要 |
Positive images including color images are obtained by imagewise exposure and development of a material which comprises at least one light-sensitive silver halide emulsion layer which contains an unfogged direct-positive silver halide emulsion, when the development is carried out in the presence of a fogging agent of the formula <IMAGE> wherein the symbols are defined as hereinafter. The fogging agent is preferably contained in a layer of the material and more preferably in the unfogged direct-positive silver halide emulsion layer. For the production of color instant images the material may also contain non-diffusible color providing compounds capable in their oxidized form of being split under alkaline photographic development conditions to release diffusible dyes.
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申请公布号 |
US4139387(A) |
申请公布日期 |
1979.02.13 |
申请号 |
US19770848095 |
申请日期 |
1977.11.03 |
申请人 |
AGFA-GEVAERT AKTIENGESELLSCHAFT |
发明人 |
VON KONIG, ANITA;ODENWALDER, HEINRICH;PETERS, MANFRED;PUSCHEL, WALTER |
分类号 |
C07D207/38;C07D257/08;C07D257/12;C07D307/52;C07D307/64;C07D471/10;G03C1/485;G03C5/50;(IPC1-7):G03C5/24;G03C1/28 |
主分类号 |
C07D207/38 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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