# Remove Background

> Remove backgrounds from images using AI segmentation. Use when user asks to remove, delete, or make transparent backgrounds from photos or images. Use when this capability is needed.

- Skill: `tomevault-io/remove-background` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/remove-background`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/remove-background/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/remove-background

---


# Remove Background

Remove image backgrounds using BiRefNet_lite model. Runs locally on CPU, MPS (Apple Silicon), or CUDA.

## When to Use

- User wants to remove background from an image
- User wants a transparent PNG version of an image
- User wants to isolate a subject from its background

## Requirements

No API keys required. Model downloads automatically on first run (~100MB, cached).

## Command

```bash
./scripts/remove_background <input_image> [options]
```

## Options

| Option | Description |
|--------|-------------|
| `input` | Input image path (required) |
| `-o, --output` | Output path (default: `{name}_nobg.png`) |
| `-c, --crop` | Smart crop to foreground bounding box |
| `-p, --padding` | Padding around crop in pixels (default: 0) |
| `--device` | Force device: cuda/mps/cpu (default: auto-detect) |
| `-f, --format` | Output: json (default) or table |

## Examples

```bash
# Basic usage - outputs photo_nobg.png
./scripts/remove_background photo.jpg

# Smart crop to subject
./scripts/remove_background photo.jpg --crop

# Smart crop with 20px padding
./scripts/remove_background photo.jpg --crop --padding 20

# Custom output path
./scripts/remove_background photo.jpg -o transparent.png

# Force CPU (if MPS has issues)
./scripts/remove_background photo.jpg --device cpu

# Human-readable output
./scripts/remove_background photo.jpg --format table
```

## Output Format

JSON (default):
```json
{
  "input": "photo.jpg",
  "output": "photo_nobg.png",
  "device": "mps",
  "original_size": [1920, 1080],
  "output_size": [800, 600],
  "cropped": true,
  "crop_box": [120, 80, 920, 680],
  "model": "ZhengPeng7/BiRefNet_lite"
}
```

## Notes

- First run downloads model (~100MB), subsequent runs use cache
- Output is always PNG with alpha channel (transparency)
- Device auto-detection: CUDA > MPS > CPU
- MPS (Apple Silicon) may have some op fallbacks to CPU

---
> Source: [nc9/skills](https://github.com/nc9/skills) — distributed by [TomeVault](https://tomevault.io).
<!-- tomevault:4.0:skill_md:2026-05-30 -->