Dilate/Erode(拡張/侵食)ノード

Expands or shrinks a mask using a morphological operator.

入力

Mask(マスク)

A grayscale image.

Properties(プロパティ)

Mode(モード)

Steps(ステップ)

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.

Threshold(しきい値)

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.

Distance(距離)

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.

Feather(フェザー)

Blurs the image.

Distance(距離)

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.

Edge(辺)

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

Falloff(減衰)

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

出力

Mask(マスク)

The resulting mask.

例

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.