> For the complete documentation index, see [llms.txt](https://docs.vntranslator.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vntranslator.com/user-guide/ocr/ocr-master.md).

# OCR Master

The OCR Master window is a control center for OCR operations, offering several features designed to enhance text recognition accuracy and workflow efficiency.

<figure><img src="/files/O4On3S30H72v2Aa7Vu1N" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
The OCR Master window is an exclusive feature available only in the **Pro Version**.
{% endhint %}

## **Opening OCR Master**

To open the OCR Master window:

* Press **Ctrl + M** in the Screen Capture, or
* Click **OCR Master** from the Menubar

***

## OCR Master Features

### **1. Preview**

The Preview section displays the captured screen image in real-time, showing you exactly what the OCR engine processes.

**Pre-processing Controls**

The OCR Master window provides direct access to pre-processing settings, allowing you to adjust them while viewing the results immediately.

* **Image Upscaler**
  * Increases the resolution of the captured image
  * Makes small or blurry text clearer and more recognizable
  * Useful for games with small font sizes
* **Image Filter**
  * **Black Text:** Optimizes for dark text on light backgrounds
  * **White Text:** Optimizes for light text on dark backgrounds
  * **Color Text:** Preserves text colors while removing background noise
* **Image Adjustments**
  * Adjust brightness, contrast, threshold, and other parameters
  * See the effect of each adjustment in real-time
  * Fine-tune settings for optimal text recognition

{% hint style="info" %}
**Note:** Pre-processing adjustments are primarily useful for traditional OCR engines (Tesseract OCR, Windows OCR). Modern and AI-based OCR engines may not require these adjustments.
{% endhint %}

### **2. Display Capture Sources**

Shows the current monitor display and the coordinates of the capture area in real-time.

### 3. **Hotkeys**

Customize keyboard shortcuts for quick access to OCR functions without interrupting your gameplay.

{% hint style="info" %}
Available key codes: <https://www.electronjs.org/docs/latest/api/accelerator#available-key-codes>
{% endhint %}

| Action               | Hotkey (default) |
| -------------------- | ---------------- |
| Capture              | Ctrl + Space     |
| Auto Capture         | Ctrl + Shift + A |
| Set Region           | Ctrl + Shift + R |
| Show/Hide OCR Screen | Ctrl + Shift + S |
| Open OCR Master      | Ctrl + Shift + M |

### 4. **Plugins**

This section will provide options for downloading and adding plugins to enhance the OCR application with additional features and integrations.

## ...