Edge Detect
Updated: 20 Feb 2025
Detect the edges in an image.
Edge Detect
Method #
This node evaluates an image to try and identify details and edges within. Useful for creating neon effects from a simple video image with a Glow node, or for highlighting edges of an image when in additive mode.
Parameters
These properties control the core behaviours of the node.
Parameter Details Active
Enables or disables the effect. Disabling the effect means it will no longer compute, so disabling a node when not in use can improve performance.
Blend Amount
Changes the opacity of the new effect over the original image.
Blend Mode (RGB)
Change how the generated effect blends with the parent image RGB.
Blend Mode (Alpha)
Change how the generated effect blends with the parent image alpha.
Affected Channels
Toggle which of the RGBA channels are affected by the effect.
Mode
Change which edge detection method is used.
- Simple : Compares pixel intensity differences with neighbours.
- Sobel : Uses a convolution kernel. Suppresses more noise compared to the Simple mode.
- Canny : Most accurate and has the least noise, but slowest.
Colour
Edit the colour of the edge
Threshold
Change the threshold for the edge detection.
Scale
Scale the brightness for the effect.
Width
Change the width of the output lines detected.
Pixel Width
When sobel mode is chosen pixel width defines the width of the edge.
The properties control the time at which the node is active. See Timeline for editing time segments.
Parameter Details Duration
Control the duration of the node’s time segment.
- Composition Duration : Use the length of the composition for the node’s time segment duration.
- Custom : Set a custom duration for the node’s time segment.
Node Time
The custom start and end time for the node.
Duration (Timecode)
The length of the node’s time segment (in time).
Duration (Frames)
The length of the node’s time segment (in frames).
Time Segment Enabled
Set whether the node’s time segment is enabled or not in the Timeline.
Inputs
These properties control the core behaviours of the node.
| Parameter | Details |
|---|---|
| Active | Enables or disables the effect. Disabling the effect means it will no longer compute, so disabling a node when not in use can improve performance. |
| Blend Amount | Changes the opacity of the new effect over the original image. |
| Blend Mode (RGB) | Change how the generated effect blends with the parent image RGB. |
| Blend Mode (Alpha) | Change how the generated effect blends with the parent image alpha. |
| Affected Channels | Toggle which of the RGBA channels are affected by the effect. |
| Mode |
Change which edge detection method is used.
|
| Colour | Edit the colour of the edge |
| Threshold | Change the threshold for the edge detection. |
| Scale | Scale the brightness for the effect. |
| Width | Change the width of the output lines detected. |
| Pixel Width | When sobel mode is chosen pixel width defines the width of the edge. |
The properties control the time at which the node is active. See Timeline for editing time segments.
| Parameter | Details |
|---|---|
| Duration |
Control the duration of the node’s time segment.
|
| Node Time | The custom start and end time for the node. |
| Duration (Timecode) | The length of the node’s time segment (in time). |
| Duration (Frames) | The length of the node’s time segment (in frames). |
| Time Segment Enabled | Set whether the node’s time segment is enabled or not in the Timeline. |
| Name | Description | Typical Input |
|---|---|---|
| Active | Enables or disables the effect. Disabling the effect means it will no longer compute, so disabling a node when not in use can improve performance. | Value |