# Setting Up OmniScope for Gamut Error Checking

Gamut errors occur when colors fall outside the acceptable range for broadcast or digital standards. This guide covers how to configure OmniScope for effective gamut error checking.

## Detecting Out-of-Gamut Signal

### Connecting with DeckLink / UltraStudio

To accurately detect out-of-gamut signals when monitoring through DeckLink or UltraStudio devices, set your signal to **Video range** and enable **Retain sub-black and super-white data** in the Video Monitoring settings:

<figure><img src="/files/4AevshuQPNBBlBjfEz5B" alt=""><figcaption><p>DaVinci Resolve Video Monitoring settings</p></figcaption></figure>

In OmniScope, verify that the video range settings for your I/O card are correctly configured:

<figure><img src="/files/sbmsmdTyzLcCW05o2Q3J" alt=""><figcaption><p>OmniScope I/O card signal range settings</p></figcaption></figure>

For monitoring in **RGB format**, enable the **Expect video range** checkbox to capture all out-of-gamut values.

### Using OpenFX Plugin in Resolve

If you're connecting via the OpenFX plugin in DaVinci Resolve, confirm that you're using **Video range** signal in the Timeline settings of the OFX:

<figure><img src="/files/Y4XdRQVgF822VwmLr7Tk" alt=""><figcaption><p>OFX plugin timeline signal range</p></figcaption></figure>

The OpenFX plugin transmits sub-black and super-white signals to OmniScope, enabling comprehensive gamut checking.

## Configuring OmniScope

With the signal sources set up, disable automatic signal scaling to the full range so that adjustments made in Resolve are preserved:

<figure><img src="/files/gCa2ruhlLMjnEhxcKVsf" alt=""><figcaption><p>Disable automatic signal scaling</p></figcaption></figure>

Once disabled, out-of-range signals will be directly visible in the waveforms:

<figure><img src="/files/Se7Ejzb5VIzUELClaYmO" alt=""><figcaption><p>Out-of-gamut values visible in waveforms</p></figcaption></figure>

Enable the **Gamut Check** in the QC menu and start the **Error Logger**. This creates a list of all gamut error events, which can be exported to a CSV file:

<figure><img src="/files/RqLOy89pZCPLdca4SLxP" alt=""><figcaption><p>QC Error Logger</p></figcaption></figure>

For more details on signal range configuration, see [Signal Range](/nobe-omniscope/sources/decklink-and-ultrastudio/signal-range.md).


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