# 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**

To receive the signal from NDI Test Patterns, right-click on the [NDI Video Monitor](https://docs.ndi.video/all/using-ndi/ndi-tools/ndi-tools-for-mac/video-monitor) tool, select the device's name, and choose `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/TfusszMIPiuB1B4OfHjD/Test%20Patterns%20-%20Main%20UI.png" alt=""><figcaption><p>Test Patterns library </p></figcaption></figure>

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## **Custom Image With Embedded Alpha**

Click the **plus button at the bottom 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.

<figure><img src="https://content.gitbook.com/content/DO9LSaUxLOBIgPjyrjR1/blobs/z4QoEj1XNYS0hkQEdAHk/Test-Patterns-alpha.png" alt=""><figcaption></figcaption></figure>

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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.


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