一旦我们得到了云彩的大概区域，要将画笔不透明度调为20%，然后开始慢慢地擦除区域中不需要的细节。

Once we get the general area of our clouds, we want to drop the brush opacity to 20% and start slowly painting away our detailed areas.

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下面，我在擦除设置中选一个大的，边缘模糊的刷子，设置到50%，去处掉在这个暗化的图层中我期望表现为亮的区域。

Then I take a large, blurred edge brush on eraser setting, set to perha 50%, and take out areas on this darkened level that I want to a ear as light.

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指定更新区域的背景是否被擦除。

Specifies whether the background within the update region is to be erased.

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