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第四页: 预处理

预处理部分使您可以设置阈值，以控制“星光”效果的出现位置，并可以使用内置的圆形蒙版限制发光区域。

阈

阈值定义突出显示的最低级别。较低的值将使图像中有更多的辉光，而较高的值将仅使非常明亮的区域发光。下图显示了在具有不同阈值的水上拍摄太阳照的Starglow输出。

源

高阈值

低门槛

阈值柔和度： 控制弱光和高光之间的边界柔和度。

使用蒙版： 选中此选项可启用内部圆形蒙版。

蒙版半径： 此控件设置内部圆形蒙版的大小（以像素为单位）。

蒙版羽化：  “蒙版羽化”值设置内部圆形蒙版的柔软度。

遮罩位置： 使用此控件定义圆形遮罩的中心点。