# Blanking Detection

Blanking Detection finds black borders around active picture content (letterboxing and pillarboxing) and can also handle slightly rotated content.

<figure><img src="/files/aK36lBV3CrS6WnNmKv41" alt=""><figcaption><p>Blanking Detection highlighting detected borders</p></figcaption></figure>

## What It Detects

* Top, bottom, left, and right blanking depth
* Rotated blanking patterns (for example, corner triangles)
* Optional overlay warnings directly in the viewer

## Where to Enable It

1. Open the **QC** panel.
2. Enable **Blanking Detection**.
3. Adjust margins and thresholds as needed.

## Settings

### Detection Margins

Set how far from each edge OmniScope should search for blanking.

### Threshold Mode

| Mode   | Typical Use             |
| ------ | ----------------------- |
| Auto   | Most workflows          |
| Full   | Full-range signals      |
| Video  | Video-range signals     |
| Custom | Manual threshold tuning |

In **Custom** mode, set R/G/B thresholds manually.

### Warning Color

Set the overlay color used when blanking is detected.

## Results and Feedback

* Overlay is drawn in the source viewer when blanking is detected.
* QC status shows active detections in real time.
* Rotation information is shown when rotated blanking is detected.
* Events are available in QC timeline workflows.

## Aspect Ratio Awareness

Blanking detection runs after input aspect-ratio handling, so letterboxed content inside another container can still be detected correctly.

## Troubleshooting Tips

* If dark scenes trigger false positives, tighten margins and/or raise thresholds.
* If rotated content is under-detected, widen margins slightly.
* If overlays are hard to see, switch to a higher-contrast warning color.

## Demo

{% embed url="<https://www.youtube.com/watch?v=78Z_rOgcioA>" %}


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