Photoshop里，羽化就是使你选定范围的图边缘达到朦胧的效果。
每个图像都是不同的，图像的像素量对于羽化值非常关键。
Every image is different and the amount of resolution in your image will play a part in your feather amount required.
闭合曲线之后，在工作区按右键选择“建立选区”(羽化值为0)。
After you have closed the path, right-click on the workspace and choose "make selection" (feather 0).
我经常会稍稍羽化我的选区，以避免粗糙的转换效果，这里，我选择了0.5的像素值。
I always feather my selections slightly to avoid harsh transitions, here I choose 0.5px as a value.
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