ComfyUI Outline Alpha Snap

A ComfyUI custom node that adds an outside-only outline around the opaque region of an image while cleaning up semi‑transparent edge pixels and removing stray islands (keeps the largest connected component only).

Node

• Name: Outline Alpha Snap
• Category: Image/Outline
• Inputs:
  • image (IMAGE)
  • width (INT): outline width in pixels (outside-only). 0 disables outline.
  • color (STRING): HTML hex color #RRGGBB or #RRGGBBAA
• Output:
  • IMAGE

Notes

• Preserves transparency, but clamps alpha to the cleaned mask (largest component only).
• Semi‑transparent pixels adjacent to solid pixels are dropped (edge snap behavior).
• RGB inputs are treated as fully opaque.

Install

Place this folder in custom_nodes/ and restart ComfyUI.

Example

• width: 1
• color: #222222