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Erode (fast)

Also known as the Dilate node, Erode (fast) controls the relative amount of dark (negative size values) and light (positive size values) pixels in the input. This can be used to grow or shrink mattes, for example, an alpha matte’s pixels can be given a positive size value to cover more area.

Erode (fast) is similar to Erode (filter), but computationally less expensive.

Inputs and Controls

Connection Type	Connection Name	Function
Input	unnamed	The image or matte to erode.

Control (UI)	Knob (Scripting)	Default Value	Function
Dilate Tab
channels	channels	all	The effect is only applied to these channels. If you set this to something other than all or none, you can use the checkboxes on the right to select individual channels.
size	size	0	Adjusts the size of pixels within the channel defined by the channels control. Positive values increase the light pixels and vice versa.
mask	N/A	disabled	Enables the associated mask channel to the right. Disabling this checkbox is the same as setting the channel to none.
mask	maskChannelInput	none	The channel to use as a mask. By default, the effect is limited to the non-black areas of this channel.
inject	inject	disabled	Copies the mask input to the predefined mask.a channel. Injecting the mask allows you to use the same mask further downstream.
invert	invert_mask	disabled	Inverts the use of the mask channel, so that the effect is limited to the non-white areas of the mask.
fringe	fringe	disabled	Blurs the edges of the mask.
mix	mix	1	Dissolves between the original image at 0 and the full effect at 1.