Transparent Cutout Cleanup
Use when removing backgrounds from generated sprites to get clean alpha edges with no halo, fringe, or leftover background pixels.
Install
$ agentstack add skill-0xheycat-isometric-game-skills-transparent-cutout-cleanup ✓ scanned · ✓ verified — works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
About
Transparent Cutout Cleanup
Overview
AI-generated sprites come on a background. Naive removal leaves a colored halo or jagged edge that screams amateur when tiles are placed together. This skill produces clean, premultiplied-safe alpha cutouts.
When to Use
- Any generated sprite needs a transparent background.
- Placed sprites show a white/gray halo or fringe.
- Edges look jagged or have leftover background color.
Process
- Generate on a PLAIN flat background (easier to key out than a busy one).
- Use a background-removal model (e.g. InSPyReNet / rembg) rather than a hard color key.
- Inspect edges at 400% zoom for halo or fringe pixels.
- Defringe / decontaminate edge color so no background tint remains.
- Erode the alpha by 1px if a faint halo persists.
- Save as PNG with straight alpha; verify on both light and dark backgrounds.
- Batch the cleaned sprites for the atlas packer.
Pair this with the ComfyUI rembg node in seamless-isometric-terrain/scripts.
Rationalizations (Stop Lying to Yourself)
| Excuse | Reality | |---|---| | "A white halo is barely visible" | On a dark tile it is glaring. Defringe every sprite. | | "Hard color-key is faster" | It eats anti-aliased edges and looks jagged. Use a proper matting model. |
Red Flags - STOP if you catch yourself:
- Visible halo/fringe when placed on a contrasting background.
- Jagged, aliased cutout edges.
- Background color contaminating semi-transparent pixels.
Verification
You are NOT done until every box is checked:
- [ ] Edges are clean at 400% zoom on light AND dark backgrounds.
- [ ] No background-color contamination on semi-transparent pixels.
- [ ] All sprites exported as straight-alpha PNG.
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: 0xheycat
- Source: 0xheycat/isometric-game-skills
- License: MIT
- Homepage: https://0xheycat.github.io/isometric-game-skills/demo/
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.