发明授权
US4154523A Exposure determination apparatus for a photographic printer 失效
用于照相打印机的曝光确定装置

Exposure determination apparatus for a photographic printer
摘要:
An exposure control apparatus for use in a photographic printer determines a color correction factor based on color densities of an original. This correction factor is then utilized in customizing a correction matrix which converts signals representing density levels to signals for use in controlling exposures.
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