在景物中设置标准灰阶标板和彩色靶标，其目的是为了确定正确的曝光量和正片印制。
The use of standard gray scale and color targets in the scene is required for correct camera exposure and positive printing.
为了使大量繁殖的浮游生物的形象得到增强，必须使这一波段的正片记录曝光过量。
It was necessary to overexpose this positive record in order to enhance the presence of the Plankton bloom.
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