Press Shift + [ or ] will increase / decrease brush hardness.

按下组合键Shift+“[”或“]”可以增大或减小画笔的硬度。

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Change your foreground color to black, the brush hardness to 0% and the opacity to 100%.

将前景色更改为黑色，画笔硬度设为0%，不透明度为100%。

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To get started, select a smallish brush with 100% hardness and start to paint over the duplicated layer with it.

准备就绪，选择一个100%硬度的短小画笔，然后用它在复制的图层上开始绘制。

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