Drag the Opacity slider to the left to reduce the effect of the filter.
将不透明度滑条向左移动会减弱滤镜的效果。
If the light gets too strong, the opacity slider on the layers menu is handy for tweaking.
如果光线太强，对图层菜单透明度滑块进行调整。
The code in Listing 30 USES the slider to control the opacity of a view.
清单30中的代码使用slider控制一个视图的透明度。
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