godot-fun
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image-region-remove-key-color-app
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Paint a region mask in a local Gradio UI, then remove key-color pixels only inside that region (global keying scoped to the brush). Preserves white/light subject pixels outside the paint strokes.
Use after image-remove-white-background when edge flood fill leaves enclosed white islands (e.g. gaps inside a silhouette).
When this skill applies, read and follow skill-dependency-manager �run scripts as documented, install missing tools into .dependency/.
app.py through the image-region-remove-key-color-app manifest entry (.dependency/image-region-remove-key-color-app/.venv/). Never use host python, py, python3, or any interpreter outside .dependency/..ai/image-region-remove-key-color-app/app.py.populated: false is not a reason to skip. Install first, set populated: true, retry the same command.From project root:
.dependency/python/python -m venv .dependency/image-region-remove-key-color-app/.venv
.dependency/image-region-remove-key-color-app/.venv/Scripts/python.exe -m pip install Pillow gradio
If python -m venv fails (missing venv / ensurepip), create the env with virtualenv from another populated skill venv, then install packages into the new env:
.dependency/rembg/.venv/Scripts/python.exe -m pip install virtualenv
.dependency/rembg/.venv/Scripts/python.exe -m virtualenv .dependency/image-region-remove-key-color-app/.venv
.dependency/image-region-remove-key-color-app/.venv/Scripts/python.exe -m pip install Pillow gradio
Register in .dependency/manifest.json:
"image-region-remove-key-color-app": {
"populated": true,
"bin": ".dependency/image-region-remove-key-color-app/.venv/Scripts/python.exe"
}
Use bin/python on Unix.
# Preload an image (opens http://127.0.0.1:7860)
.dependency/image-region-remove-key-color-app/.venv/Scripts/python.exe .ai/image-region-remove-key-color-app/app.py path/to/sprite.png
# Custom port, no auto-open browser (agent / headless)
.dependency/image-region-remove-key-color-app/.venv/Scripts/python.exe .ai/image-region-remove-key-color-app/app.py path/to/sprite.png --port 7861 --no-browser
Download uses the same filename as the source (forced .png). No share / no save-to-disk folder.
Ctrl+C in the terminal).Use the UI color picker (default #FFFFFF). CLI --preset only sets the initial color and tolerance:
--preset | Key color | Default tolerance |
|---|---|---|
white (default) | #FFFFFF | 25 |
green | #00FF00 | 40 |
magenta | #FF00FF | 40 |
global would damage white subjects; border/both left enclosed islands.app.py with the user image path; prefer --no-browser if the agent cannot open a GUI browser, and print http://127.0.0.1:<port>.| Option | Default | Notes |
|---|---|---|
| Download name | same as source (.png) | Prepared on Apply via DownloadButton |
--preset | white | Match the batch key skill |
--tolerance | preset-specific | Raise for gray fringes |
--feather | 2 | Softens hole edges inside the paint mask |
--port | 7860 | Change if busy |
| Share | off | share=False; no share UI |
| Issue | Fix |
|---|---|
| Manifest / venv missing | Follow Setup; update manifest |
No paint strokes found | Brush visibly over the white islands; ensure strokes are on the editor layers |
| Subject holes outside paint | Only paint the background islands �strokes gate keying |
| Leftover fringe in region | Raise tolerance by 5�0 |
| Port in use | Pass --port 7861 (etc.) |
| Gradio import error | Reinstall in the skill venv: pip install -U Pillow gradio |
Copy-paste commands: cli/image-region-remove-key-color-app.md
name: image-region-remove-key-color-app description: >- Interactive Gradio UI to paint a region and remove solid key-color background (white / green / magenta) only inside that selection. Use when enclosed white islands remain after border/both keying, for localized ç™½åº•æŠ å›¾, paint-to-erase chroma patches, or selective color-key cleanup before Godot sprite import.
---
name: image-region-remove-key-color-app
description: >-
Interactive Gradio UI to paint a region and remove solid key-color background
(white / green / magenta) only inside that selection. Use when enclosed white
islands remain after border/both keying, for localized ç™½åº•æŠ å›¾, paint-to-erase
chroma patches, or selective color-key cleanup before Godot sprite import.
---
# Image Region Remove Key Color App
Paint a **region mask** in a local Gradio UI, then remove **key-color pixels only inside that region** (global keying scoped to the brush). Preserves white/light subject pixels outside the paint strokes.
Use after [image-remove-white-background](../image-remove-white-background/SKILL.md) when edge flood fill leaves enclosed white islands (e.g. gaps inside a silhouette).
## Rules
When this skill applies, read and follow [skill-dependency-manager](../skill-dependency-manager.md) �run scripts as documented, install missing tools into `.dependency/`.
- Run `app.py` through the **`image-region-remove-key-color-app` manifest entry** (`.dependency/image-region-remove-key-color-app/.venv/`). Never use host `python`, `py`, `python3`, or any interpreter outside `.dependency/`.
- Do not hand-write a one-off Gradio app �use the bundled script at `.ai/image-region-remove-key-color-app/app.py`.
- `populated: false` is not a reason to skip. Install first, set `populated: true`, retry the same command.
- This skill is **interactive**: launch the UI, give the user the local URL, wait for them to paint / Apply / Download.
## Setup (first run)
From project root:
```bash
.dependency/python/python -m venv .dependency/image-region-remove-key-color-app/.venv
.dependency/image-region-remove-key-color-app/.venv/Scripts/python.exe -m pip install Pillow gradio
```
If `python -m venv` fails (missing `venv` / `ensurepip`), create the env with `virtualenv` from another populated skill venv, then install packages into the new env:
```bash
.dependency/rembg/.venv/Scripts/python.exe -m pip install virtualenv
.dependency/rembg/.venv/Scripts/python.exe -m virtualenv .dependency/image-region-remove-key-color-app/.venv
.dependency/image-region-remove-key-color-app/.venv/Scripts/python.exe -m pip install Pillow gradio
```
Register in `.dependency/manifest.json`:
```json
"image-region-remove-key-color-app": {
"populated": true,
"bin": ".dependency/image-region-remove-key-color-app/.venv/Scripts/python.exe"
}
```
Use `bin/python` on Unix.
## Quick Start
```bash
# Preload an image (opens http://127.0.0.1:7860)
.dependency/image-region-remove-key-color-app/.venv/Scripts/python.exe .ai/image-region-remove-key-color-app/app.py path/to/sprite.png
# Custom port, no auto-open browser (agent / headless)
.dependency/image-region-remove-key-color-app/.venv/Scripts/python.exe .ai/image-region-remove-key-color-app/app.py path/to/sprite.png --port 7861 --no-browser
```
Download uses the **same filename** as the source (forced `.png`). No share / no save-to-disk folder.
## UI workflow
1. **Upload** the image via the file control (or preload via CLI) �do not drop into the editor canvas.
2. Transparent areas appear as **gray** in the editor (download still has real alpha).
3. **Paint** over local white / chroma patches to remove.
4. Choose **Key color** / tolerance / feather if needed.
5. Click **Apply** �preview (gray = transparent).
6. Click **Download** �browser download with the original name.
7. Click **Stop server** when done (or `Ctrl+C` in the terminal).
## Key color
Use the UI color picker (default `#FFFFFF`). CLI `--preset` only sets the initial color and tolerance:
| `--preset` | Key color | Default tolerance |
|------------|-----------|-------------------|
| `white` *(default)* | `#FFFFFF` | 25 |
| `green` | `#00FF00` | 40 |
| `magenta` | `#FF00FF` | 40 |
## Agent workflow
1. **When** �user needs selective / painted removal of flat key-color patches; full-image `global` would damage white subjects; `border`/`both` left enclosed islands.
2. **Ensure deps** �manifest entry + venv with Pillow + Gradio.
3. **Launch** �run `app.py` with the user image path; prefer `--no-browser` if the agent cannot open a GUI browser, and print `http://127.0.0.1:<port>`.
4. **Hand off** �tell the user to paint, Apply, then Download (same filename as source).
5. **Verify** �after the user confirms download, they are done; do not overwrite sources.
6. **Stop** �click **Stop server** in the UI, or terminate the Gradio process when the user is done.
## Defaults
| Option | Default | Notes |
|--------|---------|-------|
| Download name | same as source (`.png`) | Prepared on Apply via `DownloadButton` |
| `--preset` | `white` | Match the batch key skill |
| `--tolerance` | preset-specific | Raise for gray fringes |
| `--feather` | `2` | Softens hole edges inside the paint mask |
| `--port` | `7860` | Change if busy |
| Share | off | `share=False`; no share UI |
## Troubleshooting
| Issue | Fix |
|-------|-----|
| Manifest / venv missing | Follow **Setup**; update manifest |
| `No paint strokes found` | Brush visibly over the white islands; ensure strokes are on the editor layers |
| Subject holes outside paint | Only paint the background islands �strokes gate keying |
| Leftover fringe in region | Raise tolerance by 5�0 |
| Port in use | Pass `--port 7861` (etc.) |
| Gradio import error | Reinstall in the skill venv: `pip install -U Pillow gradio` |
## CLI
Copy-paste commands: [cli/image-region-remove-key-color-app.md](../../../cli/image-region-remove-key-color-app.md)
## Related
- Full-image / batch keying: [image-remove-white-background](../image-remove-white-background/SKILL.md)
- AI matting: [image-remove-background](../image-remove-background/SKILL.md)
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
68/100
Promising
Trust
62/100
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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