Gamut Scope helps you keep track if your pixels are within P3 gamut when input signal is Rec2020 (ST2048 PQ).
It works in False Color mode - pixels within range are rendered in grayscale, pixels near the gamut edge are colored orange and out of gamut pixels are rendered with red color:
You can also use Gamut Scope to monitor your real luminosity (nits) and set a threshold for max luminosity:
Setting the threshold to 500 nits
In the scope we can see what part of the image exceeded the given brightness:
Directional Indicators (1.11.22+)
Directional arrows show which way colors move to return to gamut.
Gamut Error Display (1.10.134+)
Gamut errors are highlighted for both SDR and HDR signals.