当你选择手电筒效果后，在预览窗口中应该可以看到你的图像中间会一个小的聚光灯。
Once you choose Flashlight, look at the preview window and you'll see a small spotlight in the center of your image.
点击确定后，滤镜效果就会生效，将周围环境暗色化，并制造出一个柔化聚光灯的效果。
When you click OK, the filter applies the effect, darkening the surrounding area and creating the soft spotlight effect you see here.
如何使用石英做的聚光灯效果？
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