# Test Patterns

**NDI Test Patterns** is a tool designed to facilitate precise audio and video calibration on NDI-enabled devices within your network. 

With a range of test patterns and audio tones, this tool ensures accurate color properties and optimal sound levels.

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Download NDI Tools [here](https://ndi.video/tools/download/).
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## **Accessing NDI Test Patterns**

[Install NDI Tools](https://docs.ndi.video/all/using-ndi/ndi-tools/installing-ndi-tools) and run NDI Test Patterns from the [NDI launcher](https://docs.ndi.video/all/using-ndi/ndi-tools/ndi-tools-launcher) or your applications list.

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## **Immediate NDI Signal Sharing**

Upon launching, NDI Test Patterns will instantly share an **NDI signal** across your network, viewable on other NDI-enabled devices using software like Studio Monitor. 

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## **Viewing the NDI Signal**

Right-click on the [NDI Studio Monitor](https://docs.ndi.video/all/using-ndi/ndi-tools/ndi-tools-for-windows/studio-monitor) tool, select the device's name and choose **Test Patterns** to receive the signal from NDI Test Patterns.

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## **Test Pattern Variety**

Explore a variety of test patterns by scrolling down the page and selecting the one that best suits your calibration needs.

<figure><img src="https://content.gitbook.com/content/DO9LSaUxLOBIgPjyrjR1/blobs/xLYiB0TYU8PxdtN68IDM/1.%20Test%20Patterns%20SDR.JPG" alt=""><figcaption><p>Test Patterns library (HDR options to be released with NDI 6).</p></figcaption></figure>

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## **Custom Image Support**

Click the plus button at the bottom left of the screen to add custom images to the list of patterns in NDI Test Patterns.

NDI Test Patterns supports images with embedded alpha[^1], allowing you to load most 32-bit image file formats and use them as sources for overlays in your program.

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## **Audio Calibration**

Enable a one-kilohertz tone accompanying the NDI test pattern signal to test your audio equipment. Choose from various decibel levels to suit your audio calibration requirements.

[^1]: The **alpha channel** is a color component that represents a color's degree of transparency or opacity (i.e., the red, green, and blue channels). It determines how a pixel is rendered when blended with another.