另外，许多相机也有一个功能，就是可以马上告诉你图像中是否有过曝或欠曝的地方。
Additionally, in many cameras, there is a feature that can be used to quickly tell you if there are areas of lost pixel detail due to over or underexposure.
让被摄者靠近光源并有选择地让被摄对象的某些部分欠曝，摄影师能让光线照亮被摄者最重要的部分。
By positioning the subject near the light source and allowing some of the subject to underexpose, the photographer can let light touch only the most important part of the subject.
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