## Documentation Index

Fetch the complete documentation index at: [/llms.txt](https://docs.beeble.ai/llms.txt)

Use this file to discover all available pages before exploring further.

## Introducing Background Remover: Professional Grade AI Rotoscoping

Background Remover is available exclusively on **Beeble (Cloud app)**. It is not available in Beeble Studio.

**Background Remover** extracts clean alpha mattes from your footage using AI, producing background-free results ready for compositing and VFX work. Upload a video, image sequence, or image, and the AI generates a precise foreground mask automatically.

For generating a full set of VFX passes (alpha, depth, normal, PBR maps), see [VFX Pass Generator](https://docs.beeble.ai/beeble/vfx-pass-generator).

---

## How It Works

### Step 1: Choose Alpha Model

Select the AI model best suited for your footage:

|  | **MatAnyone** (default) | **CorridorKey** |
| --- | --- | --- |
| **Purpose** | Good for general background removal | Perfect green screen keys |
| **Learn More** | [MatAnyone GitHub repository](https://github.com/pq-yang/MatAnyone) | [CorridorKey demo on YouTube](https://www.youtube.com/watch?v=3Ploi723hg4) |
| **How it works** | **Stage 1**: Pick a keyframe and provide an alpha mask with our interactive masking tool.<br>**Stage 2**: Propagate the alpha mask across all frames. | **Stage 1**: **MatAnyone** generates an alpha hint for every frame.<br>**Stage 2**: **CorridorKey** removes the green spill and refines the matte. |

### Step 2: Upload Your Footage

Upload your footage to begin. Background Remover supports three source types:

- **Video** — MP4, MOV
- **Image Sequence** — Sequence of image frames
- **Single Image** — PNG, JPG

### Step 3: Preview Frame (Optional)

A preview frame is extracted from your video with a **rough alpha estimation** generated on it, so you can review the overall quality before committing to full extraction.

### Step 4: Refinement (Optional)

If the preview alpha needs adjustment, you can refine it interactively by clicking the **Edit Alpha** button in the Preview Dialog.

**Skip Review mode** — You can choose to **Skip Review** during upload, which bypasses the preview step (Steps 3–4) and runs full extraction immediately.

### Step 5: Full Extraction

Once you approve the preview frame (or skip it), full extraction runs across all frames.

### Step 6: Download Results

When extraction completes, download your results. You can also **bulk download** multiple completed results at once.

---

## Specifications

These specifications are for **Beeble (Cloud)**. Specifications may be updated as the platform evolves.

### Upload Format

- Video
- Image Sequence
- Image

|  | Beeble (Cloud app) |
| --- | --- |
| **File Format** | MP4 (H.264), MOV (ProRes 422, 4444, H.265) |
| **Max Size** | 2 GB |
| **Resolution** | Up to 2K (2048 px)<br>_- Downscaled if larger_ |
| **Frame Count** | Up to 3600 frames<br>_- e.g. 60s @ 60fps or 120s @ 30fps (Professional plan)_ |
| **FPS** | Up to 60 FPS<br>_- Reduced if higher_ |
| **Color** | Rec. 709 for best quality<br>_- Other color spaces, such as Log, may degrade quality_ |

|  | Beeble (Cloud app) |
| --- | --- |
| **File Format** | PNG, JPG, JPEG |
| **Max Size** | 100 MB per file |
| **Resolution** | Up to 2K (2048 px)<br>_- Rejected if larger_ |
| **Max Frames** | Up to 2000 frames |
| **Color** | sRGB for best quality<br>_- Other color spaces, such as Log, may degrade quality_ |

**Best Quality Settings** - Use Rec. 709 / sRGB color space. Beeble (Cloud app) supports up to 2K and 3600 frames per video (60s @ 60fps).

### Output Format

Background Remover produces two output types:

- **RGBA** — Background removed result with transparency applied.
- **Alpha** — Grayscale alpha matte (foreground mask).

| Format | Color Channels | Bit Depth | Color Space | Note |
| --- | --- | --- | --- | --- |
| **MOV** | RGBA (4-ch) | 10-bit | sRGB | Alpha-embedded video for compositing |
| **PNG Sequence** | RGBA (4-ch) | 8-bit | sRGB | Frame-by-frame PNG with transparency |
| **PNG** | RGBA (4-ch) | 8-bit | sRGB | Single image with transparency |

The MOV output contains an embedded alpha channel, so you can drop it directly into After Effects, DaVinci Resolve, Final Cut Pro, or any editor that supports alpha video. No separate alpha matte needed.

| Format | Color Channels | Bit Depth | Color Space | Note |
| --- | --- | --- | --- | --- |
| **MOV** | Grayscale (1-ch) | 8-bit | — | Grayscale matte |
| **PNG Sequence** | Grayscale (1-ch) | 8-bit | — | Grayscale matte |
| **PNG** | Grayscale (1-ch) | 8-bit | — | Grayscale matte |

---

## Tips for Best Results

For the best alpha extraction results:

- Use footage with **clear contrast** between subject and background
- Ensure the subject is **well-lit** and in sharp focus
- Avoid footage with **excessive motion blur**
- Use **high-resolution** source material when possible
- For videos, review and refine the preview frame before running full extraction.