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Erode (blur)

Similar to Erode (filter), but smoother, input pixels are filtered relative to the size control. Negative values cause brighter areas to expand into darker areas and positive values cause darker areas to expand into lighter areas - particularly useful with mattes. Additionally, you can add blur to the input using the blur and quality controls.

NOTE: Solid areas of any color other than 0 or 1 change their color as they are treated as the anti-aliased edge. This can be corrected by using a different algorithm, such as the Erode (filter) node.

Inputs and Controls

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

Control (UI)	Knob (Scripting)	Default Value	Function
Erode Tab
channels	channels	none	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	-1	Adjusts the size of pixels within the channel defined by the channels control. Negative values increase the light pixels and vice versa.
blur	blur	0	Blurs the edges of the generated mask.
quality	quality	15	Quality of the initial blur. Smaller values take less time to process.
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.