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Outline

Node icon
Filter

Adds a solid-color outline around the visible content of an image, positioned inside, outside, or centered on the edge.

The Outline node applied to a source image: original (left) and result (right).
Side-by-side comparison: the original image on the left and the same image after the Outline node on the right.

Outline finds the edge of the opaque content (anything at or above Alpha Threshold) and draws a solid stroke around it, growing outward, inward, or straddling the edge. Outline Only outputs just the stroke on a transparent background, for compositing or recoloring it separately.

Parameters

Section titled “Parameters”

Pins

ImageImage
InputRequired
ImageImage
Output

Outline

ThicknessInteger · px/%
Default: 1 Range: 1–256 px / 0–100%

Width of the outline

PositionChoice
Default: Outside
  • OutsideOutline grows outward from the shape edge, so content stays fully visible.
  • InsideOutline grows inward from the shape edge, covering the outermost content pixels.
  • CenterOutline straddles the edge: half inside, half outside.
ColorColor (RGBA)
Default: rgba(0, 0, 0, 255)

Outline color

Alpha ThresholdInteger
Default: 128 Range: 1–255

Pixels with alpha >= threshold are considered solid for outline detection

Options

SmoothingChoice
Default: Rounded
  • NoneHard pixel edges, crisp and aliased.
  • RoundedSmooth outline with rounded corners (the default). Cleaner edges without a visible glow.
  • Outer GlowSoft blurred outline that creates a halo/glow effect around the content.
Outline OnlyToggle
Default: false

Output just the outline on a transparent background, without the original image

Usage Tips

Section titled “Usage Tips”
  • Use the Inside position for bordered icon or badge effects. On a fully opaque image, Inside outlines the image’s border.
  • Use Outer Glow smoothing for a soft halo around the content.
Section titled “Related Nodes”