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答:在加工后的电影正片上,未曝光的部分应该是无色透明的,灰雾度很小。因为灰雾的大小直接影响到光通量。如,影片上有密度0.3的灰雾,就会比没有灰雾的影片的光通量降低一半,画面调子灰暗(即反差降低)。对声音来说,灰雾大时会使输出的音量显著降低。不过,要求完全无色透明是有困难的。因为片基本身有密度,乳剂中的明胶也有密度,未曝光的卤化银经显影后,局部也会还原为金属银,形成灰雾。在彩色片
A: In the processing of positive film, the unexposed part should be colorless and transparent, the fog is very small. Because the size of the fog directly affects the luminous flux. For example, a film with a density of 0.3 fog will have a half-tone reduction (ie, contrast reduction) than a non-fog film. For sound, large fog can cause a significant reduction in the volume of the output. However, it is difficult to require completely colorless and transparent. Because the tablet itself has a density, gelatin in the emulsion also has a density, unexposed silver halide after development, the local will be reduced to metallic silver, the formation of fog. In color film