> For the complete documentation index, see [llms.txt](https://docs.timeinpixels.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.timeinpixels.com/nobe-omniscope/features/crop.md).

# Crop

Crop lets you isolate a specific region of the input frame so that only that area is analysed by scopes and QC tools. This is especially useful when monitoring a **Screen Capture** source where the application window occupies only part of the screen, or when you want to focus analysis on a particular section of the image.

<figure><img src="/files/FJNXYRTjXAMPouAUfOi3" alt=""><figcaption><p>Crop overlay with position, dimensions, and aspect ratio</p></figcaption></figure>

## Opening the Crop Window

There are several ways to open crop:

| Method           | Action                                           |
| ---------------- | ------------------------------------------------ |
| **Menu**         | **View > Crop…**                                 |
| **Keyboard**     | **⌥C** (macOS) / **Alt+C** (Windows)             |
| **Input strip**  | Click the **crop icon** on the input thumbnail   |
| **Context menu** | Right-click an input source and select **Crop…** |

When crop is active, the full-screen overlay shows the current frame with draggable crop handles.

## Using Crop

1. **Open** the crop window — the full source frame is displayed as an overlay
2. **Drag the edges or corners** to adjust the crop region
3. **Drag inside** the crop rectangle to reposition it
4. The overlay displays the **position** (X, Y), **dimensions** (W, H), and **aspect ratio** of the cropped area in real time
5. Click **Apply Crop** to confirm, or **Reset** to restore the full frame

## Keyboard Shortcuts

| macOS | Windows | Action                             |
| ----- | ------- | ---------------------------------- |
| ⌥C    | Alt+C   | Toggle crop window                 |
| ⌥R    | Alt+R   | Reset crop                         |
| ESC   | ESC     | Close crop window without applying |

## Per-Input Crop

Crop settings are saved **per input source**. Each connected input can have its own independent crop region. When switching between inputs or loading layouts, crop settings are restored automatically.

If you set an **input aspect ratio** (for example 1.85, 2.39, or 9:16), OmniScope keeps the full source image on the axis that still fits and adds blanking on the opposite axis as needed. It does not trim the source from the wrong sides just to satisfy the ratio.

You can toggle crop on or off for a specific input slot using the **Toggle crop** action in the [Action Editor](/nobe-omniscope/action-editor.md) or [StreamDeck](/nobe-omniscope/streamdeck/available-actions.md).

## Crop and Snapshots

By default, snapshots include the crop. From version **1.11.9+** you can choose to take snapshots **without** the crop applied — useful when you want to capture the full frame for reference while analysing a cropped region.

## Common Use Cases

* **Screen Capture monitoring** — crop to the video player or NLE viewer area and ignore the rest of the screen
* **Letterbox / pillarbox removal** — crop out black bars to get accurate scope readings of the active picture only
* **Region-of-interest analysis** — focus waveform, vectorscope, and histogram analysis on a specific area of the frame (e.g. skin tones, sky, shadows)

## Related

* [Screen Capture](/nobe-omniscope/sources/screen-capture.md)
* [Keyboard Shortcuts](/nobe-omniscope/settings-and-preferences/keyboard-shortcuts.md)
* [Available Actions](/nobe-omniscope/streamdeck/available-actions.md)