膨胀/腐蚀节点

Expands or shrinks a mask using a morphological operator.

输入

遮罩

一幅灰度图像。

属性

模式

• 步数 (阶梯)

  Sets each pixel to the maximum (for dilation) or minimum (for erosion) value that’s found within a square surrounding it. This approach keeps the original gray levels and is best suited for masks that contain sharp corners; rounded shapes such as circles will look more square-like in the output.

  Despite the name, this is not an iterative process; the dilation/erosion is only performed once regardless of the chosen Distance.

  阈值

  Makes all the pixels fully black or white depending on whether they’re darker or brighter than 50% gray. Then, sets each pixel to the maximum (for dilation) or minimum (for erosion) value that’s found within a circle surrounding it. This approach loses the original gray levels. Shape wise, it’s well-suited for masks that contain rounded corners; sharp ones will be rounded off.

  距离

  Sets each pixel to the maximum (for dilation) or minimum (for erosion) value that’s found within a circle surrounding it. This approach preserves the original gray levels and is well-suited for masks that contain rounded corners.

  羽化

  Blurs the image.

距离

The size of the surrounding area to look at for each pixel; or in other words, how much to dilate (for positive values) or erode (for negative values) the mask.

边

For the Threshold mode, determines how much to blur the edges after dilation/erosion.

衰减

For the Feather mode, determines the brightness curve of the blurred edges.

输出

遮罩

生成的遮罩。

例子

In the image below, notice that:

• The light gray disk has turned white and the dark gray rectangle has turned black because of the Threshold mode.

• The shapes have become thicker — dilated because of the positive Distance.

• The shapes appear blurred because of the positive Edge.