无网曝光：是增加半色调图片的光部对比的方法。摄制时把网片除下作短时间曝光使光部的网点消失。
Bump exposure: Method of increasing highlight contrast when producing a half-tone by removing the screen briefly to remove any dots in the highlight area.
要对移动物体拍照的相机元件需要短时间曝光以避免失真。
Camera sensors acquiring images of a moving object require a short exposure time to avoid blur.
为了获得有充分对比的影像，元件需要在短时间内有充足的光线进行曝光。
To obtain an image with enough contrast, the sensor needs to be exposed to a sufficient amount of light during a short amount of time.
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