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Outline

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

Outline detects the boundary of opaque content using the alpha channel and draws a configurable outline around it. The Alpha Threshold controls what counts as “solid” content. Position determines whether the outline grows outward, inward, or straddles the edge.

Smoothing options range from None (hard pixel edges) to Rounded (smooth outline with rounded corners, the default) to Outer Glow (a soft blurred outline). Outline Only mode outputs just the outline on a transparent background, useful for compositing the outline separately.

Parameters

Section titled “Parameters”

Outline

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

Width of the outline in pixels

PositionChoice
Default: Outside

Where the outline is placed relative to the shape edge

  • OutsideOutline grows outward from the shape edge — content stays fully visible.
  • InsideOutline grows inward from the shape edge — covers the outermost content pixels.
  • CenterOutline straddles the edge — half inside, half outside.
int0–255
Default: Outline color red component Range: (part of color)
int0–255
Default: Outline color green component Range: (part of color)
int0–255
Default: Outline color blue component Range: (part of color)
int0–255
Default: Outline color alpha component Range: (part of color)
Alpha ThresholdInteger
Default: 128 Range: 1–255

Pixels with alpha >= threshold are considered solid

Options

SmoothingChoice
Default: Rounded

None = hard edges, Rounded = smooth outline with rounded corners, Outer Glow = soft blur

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

Output just the outline on transparent background

Usage Tips

Section titled “Usage Tips”
  • Use Outside position to add an outline without covering any of the original content.
  • Inside position works well for creating bordered icon or badge effects.
  • Enable Outline Only to get just the stroke for separate compositing or color adjustment.
  • Use Outer Glow smoothing for a soft halo effect around the content.
Section titled “Related Nodes”