Dilate/Erode Node

The Dilate/Erode node expands and shrinks masks, using a morphological operator.

Inputs

Mask

Single color channel (or a black-and-white image) input.

Properties

Mode

Step, Threshold, Distance, Feather

Distance

The Distance is the filter radius. A positive value of Distance dilates (expands) the influence of a pixel on its surrounding pixels. A negative value erodes (shrinks) its influence.

Edge

Edge to inset.

Falloff

Falloff type the feather.

Outputs

Mask

The filtered mask output.

Example

In this example, we wanted to take the rather boring array of ball bearings and add some variation to it. So, we dilated the red and eroded the green, leaving the blue alone. If we had dilated both red and green… (hint: red and green make yellow). The amount of influence is increased by increasing the Distance values. Blend-file available here.