随着数码摄影时代的到来,传统胶片摄影时代被普遍使用的很多摄影滤镜被抛弃了,因为这些滤镜的效果在后期数码影像处理中可以借助数码影像处理软件来获得。但是在数码摄影中保留下来的三种摄影滤镜,在摄影中仍然发挥着重要作用。它们就是中灰密度滤镜、中灰密度渐变滤镜和偏振镜。 With the advent of the digital photography era, many photographic filters that are commonly used in traditional film photography are discarded, as the effects of these filters can be obtained with digital imaging software in post-digital imaging. However, the three photographic filters preserved in digital photography still play an important role in photography. They are medium gray density filters, medium gray density gradient filters and polarizers.