ComfyUI Shadow/Outline Node

One node for ComfyUI that takes an IMAGE with alpha after background removal and returns either:

• shadow only
• outline only

Install

1. Create this folder: ComfyUI/custom_nodes/comfyui-shadow-outline
2. Put these files into it:
   • __init__.py
   • shadow_effect_node.py
3. Restart ComfyUI

Node location

image/wps -> Shadow Or Outline From Alpha

Input

• image — PNG/IMAGE with alpha after rembg or any other background removal step

Modes

• shadow — creates a separate shadow from the silhouette
• outline — creates a separate outline without the original subject

General settings

• threshold — removes weak alpha noise before creating the effect

Outline settings

• outline_thickness — outline thickness
• outline_feather — softens outline edges
• outline_r/g/b — outline color
• outline_opacity — outline opacity

Shadow settings

• shadow_blur — shadow softness
• shadow_expand — silhouette expansion before blur
• shadow_offset_x, shadow_offset_y — shadow offset
• shadow_opacity — shadow opacity
• shadow_r/g/b — shadow color

Recommended values

For shadow

• mode = shadow
• threshold = 10
• shadow_blur = 18
• shadow_expand = 4
• shadow_offset_x = 0
• shadow_offset_y = 16
• shadow_opacity = 0.28
• shadow_r/g/b = 0/0/0

For outline

• mode = outline
• threshold = 10
• outline_thickness = 8
• outline_feather = 2
• outline_opacity = 1.0
• outline_r/g/b = 0/0/0

Important

This node expects the input image to already contain an alpha channel. If the image has no alpha channel, the effect will be generated from the full rectangular image area.

Tips

• Increase threshold if rembg leaves faint edge noise.
• Increase outline_feather for softer sticker-like outlines.
• Increase shadow_expand for a wider shadow shape.
• Increase shadow_blur for a softer shadow.