How the test works

A screen’s colour gamut is the range of colours it can show. This test checks red and green – the colours where the common standards differ most.

You see two rows, Red and Green, with six boxes each. Every frame is the most vivid red or green defined by Rec.2020, beyond what almost any screen can show, so your screen draws it at its own most vivid. The small squares inside go from standard sRGB, through Display-P3, towards Rec.2020, all at the same brightness. Labels under the boxes mark sRGB, P3 and 2020, with dots for the steps between.

In each row, click the first box where the square blends into its frame. Watch the colour, not the brightness. Once a square is more vivid than your screen can show, it looks the same as the frame – that is where your screen’s range ends. The last box always matches.

sRGB, P3 and Rec.2020 in plain words

• sRGB – the standard colours of the web, most apps, photos and games. Most modern screens cover all or nearly all of it, though some budget laptops fall short.
• Display-P3 – a wider range with deeper reds and greens. Most HDR films are made within its range, and many modern phones and recent Macs can show it.
• Rec.2020 – the colour range that HDR video is stored in. It is wider still, and almost no screen covers it fully.

Reading your result

The result is one of five steps: Standard (sRGB), Slightly wide, Wide (P3), Very wide or Ultra wide (near Rec.2020). The card also says how far red and green each reach.

A wider gamut is not automatically better. Content made for sRGB – most web pages and many games – should look like sRGB. When a screen stretches it to its full wide range, colours look oversaturated and faces can look too red. That is why many wide-gamut monitors offer an sRGB mode.

If your colours look limited

• Windows with HDR off: browsers usually show web pages in sRGB colours, so the result can be Standard even on a wide-gamut screen. If your screen supports HDR, turn it on (Win + Alt + B, or Settings → System → Display → Use HDR) to see wide colours, then run the test again.
• Monitor in sRGB mode: if your monitor has an sRGB mode or a colour-space setting, switch it to Native or Wide for games and films. Keep sRGB for colour-accurate work on standard content, such as editing photos for the web.
• Browser: the Colours card shows what your browser reports. Chrome or Edge work best.
• iPhone: Safari can’t go full screen, so the test suggests Share → Add to Home Screen.

To check bright highlights and smooth colour ramps as well, try the HDR test and the banding test.

More single tests

• HDR brightnessHow bright highlights get, and how much big bright areas dim.
• Black levelTrue black and the darkest shadow detail.
• GradientsStripes in smooth colour ramps – 8-bit or 10-bit.
• Refresh rateYour Hz right away, plus motion clarity.
• Dead pixelsDark or stuck dots on full-screen colours.
• Burn-inFaint shapes left by static images on OLED.
• UniformityPatches, darker edges and backlight bleed.