带有人工光的夜景几乎总有暗调子的情况(即low - key直方图)，否则就会出现明显的高光反差(blown highlight)。
Night scenes which contain artificial light sources should almost always have low-key histograms, otherwise these will have significant blown highlights.
反差度还将因某些杂散自然光的存在而降低。
The degree of contrast will also be diminished by the presence of some vagrant ordinary light .
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