ComfyUI Texture Packer - Alpha Edge Solidify

A ComfyUI custom node that converts RGBA-style assets into fully solid RGB textures by bleeding edge colours outward from the alpha mask.

Intended for foliage, grass, decals, and cutout assets to prevent edge halos and mipmap bleeding in game engines.

<img width="1304" height="607" alt="{1CF15327-E180-45AA-BC6A-25EF5AE841F2}" src="https://github.com/user-attachments/assets/26cbed17-2afb-4453-91b3-4f3b92ca2f9a" />

The Problem

When working with alpha-cutout textures in game engines, the RGB data in transparent areas can cause visible artifacts:

• Edge halos - light or dark fringes around cutout edges
• Mipmap bleeding - colours from transparent regions bleeding into visible areas at lower mip levels
• Atlas artifacts - neighbouring textures contaminating edges in texture atlases

Artists typically solve this with a "solidify" or "alpha bleed" pass in tools like Photoshop, Substance Painter, or TexturePacker.

This node brings that workflow into ComfyUI.

Installation

1. Clone or download this repository
2. Place the folder in your ComfyUI/custom_nodes/ directory
3. Restart ComfyUI

ComfyUI/
└── custom_nodes/
    └── comfyui-texture-packer/
        ├── __init__.py
        ├── nodes.py
        └── README.md

Usage

1. Load your RGBA texture using Load Image
2. Connect the IMAGE output to the node's image input
3. Connect the MASK output to the node's mask input
4. Run the workflow
5. Save the resulting solid RGB texture

Note: ComfyUI auto-inverts masks from Load Image. You may need to use an Invert Mask node before connecting to this node.

Node: Alpha Edge Solidify -> RGB

Inputs

| Input | Type | Default | Description | |-------|------|---------|-------------| | image | IMAGE | - | RGB input from Load Image | | mask | MASK | - | Alpha mask from Load Image | | bleed_pixels | INT | 64 | How many pixels to bleed outward (1-256) | | mask_threshold | FLOAT | 0.5 | Threshold for what counts as "inside" the mask (0-1) | | kernel_size | INT | 3 | Dilation kernel size: 3, 5, or 7 | | mode | ENUM | basic | basic for speed, smooth for quality |

Output

| Output | Type | Description | |--------|------|-------------| | image | IMAGE | Fully solid RGB texture (no alpha) |

Modes

• basic - Fast iterative dilation using uniform neighbor averaging. Good for most use cases.
• smooth - Distance-weighted averaging for smoother colour gradients. Better for large bleed distances.

Use Cases

• Game engine assets (Unity, Unreal, Godot, etc.)
• Foliage and vegetation textures
• Decals and stickers
• UI elements with alpha cutouts
• Texture atlas preparation
• Any mip-mapped alpha-tested materials

Requirements

• ComfyUI
• PyTorch (included with ComfyUI)

No additional dependencies required.

License

MIT

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This project was built with Claude Code.