A lightweight ComfyUI node for blending multiple masks together with adjustable strength per mask.
Useful for compositing hand-painted or region-based mask layers directly inside ComfyUI — without needing Photoshop, Krita, or external editors.
- Accepts 1 to 5 mask inputs
- Each mask has its own strength slider (0.00 to 1.00)
- Masks are composited using Max / Add / Multiply / Lighten / Darken blend modes
- Outputs a single final mask
- Supports overlapping paint regions cleanly
- Works directly with the built-in Mask Editor node
You can paint:
- Hair region
- Clothing region
- Background elements
- Highlight areas
- Shadow regions
Then feed each mask into this node to produce a unified multi-level mask for:
- Image-to-Image refinement
- Region control
- Flux / SDXL selective guidance
- Depth shading workflows
- Layer-based artistic control
Place the folder into:
Place the folder into:
ComfyUI/custom_nodes/GPT5-MaskTools
Then restart ComfyUI.
The new node appears under:
Mask → GPT5 Mask Blend
| Mode | What it Does |
|---|---|
| Max | Takes the highest mask value (default). Best for layering painted regions. |
| Add | Adds masks together. Useful for soft layering. |
| Multiply | Darkens intersections. Good for weight-based masking. |
| Lighten | Similar to Max but smoother transitions. |
| Darken | Keeps common intersection darkness. Experimental/artistic. |
Created by: shawnlau23-coder
Node Logic + Implementation: GPT-5 (ChatGPT)
If you improve the node, please submit PRs — this is designed to be community-extendable.
(Not implemented — but easy to add if needed)
- Per-mask invert toggle
- Soft-edge / feathering control
- Live node thumbnail preview
- Region boundary auto-blur
We intentionally did not add these to avoid clutter — the goal is clean & focused mask compositing.
MIT — free for personal and commercial use.