The primaries read-only property of the VideoColorSpace interface returns the color gamut of the video.

A string containing one of the following values:

"bt709"

Color primaries used by BT.709 and sRGB.

"bt470bg"

Color primaries used by BT.601 PAL.

"smpte170m"

Color primaries used by BT.601 NTSC.

In the following example, colorSpace is a VideoColorSpace object returned from VideoFrame. The value of primaries is printed to the console.

let colorSpace = VideoFrame.colorSpace;
console.log(colorSpace.primaries);