Color Gamut Explained: sRGB vs DCI-P3 vs Adobe RGB

"99% sRGB" and "95% DCI-P3" describe how many colors a display can show. Here's how to read them — and when a bigger number actually makes your screen worse.

What is a gamut?

A gamut is the range of colors a display can reproduce, plotted on a standard color space. Every color a screen can make comes from mixing its three primaries — red, green, and blue — so the gamut is the triangle those three primaries draw on a chromaticity diagram. Bigger triangle = more saturated, vivid colors are possible.

Two things follow from that, and both matter:

• A gamut says nothing about accuracy. A panel can cover 99% of sRGB and still show every color slightly wrong. That's a separate measurement — see Color Accuracy and Delta E.
• A gamut says nothing about brightness or contrast. Those are what make HDR look like HDR, which is why gamut alone is a poor HDR spec. HDR Explained has the rest.

The three you'll see

• sRGB — the web and most everyday content standard. Almost every photo, website, game, and SDR video you look at is authored for it. Aim for ~99–100% sRGB coverage.
• DCI-P3 — a wider gamut used for HDR video and modern phones/laptops. It extends mainly into deep reds and greens. ~90%+ P3 looks noticeably richer on HDR movies and games.
• Adobe RGB — wide in the greens/cyans, used in print workflows because it maps better onto what CMYK ink can reproduce. Mostly relevant to photographers preparing for print.

There's also Rec. 2020, the target for future HDR video. No consumer display fully covers it — even the best OLED TVs measure in the 80–90% range — so treat any Rec. 2020 percentage on a spec sheet as a rough indicator rather than a promise.

| Space | Roughly what it's for | Sensible target | |---|---|---| | sRGB | Web, office, SDR games, most photos | 99–100% coverage | | DCI-P3 | HDR film and TV, phone displays | 90%+ coverage | | Adobe RGB | Photo editing headed for print | 95%+ coverage |

Coverage vs volume

These two numbers get used interchangeably in marketing, and they are not the same thing.

• Coverage: how much of the target space the display actually reaches (e.g. 98% sRGB). This is the number you want. It can never exceed 100%.
• Volume: how big the panel's gamut is relative to the target. It can exceed 100% if the panel is wider than the target — extra saturation that isn't always useful.

A monitor advertised as "125% sRGB" is quoting volume. It might still only cover 96% of sRGB, because the parts it overshoots don't compensate for the parts it misses. If a listing gives you one number with no label, assume it's the flattering one.

Why too-wide can hurt

A wide-gamut monitor with no sRGB clamp makes everyday sRGB content look oversaturated. Skin tones go sunburnt, red logos glow, and greens turn radioactive. This happens because most desktop applications send sRGB values straight to the panel without translating them, so a value that should be moderate red gets displayed as the panel's most saturated red.

Signs you're seeing it:

• Faces look flushed or orange in photos that look fine on your phone.
• Reds and greens in a browser look cartoonish next to the same page elsewhere.
• The effect is strongest on saturated colors and absent on greys.

The fix is the monitor's sRGB mode — a clamp that restricts the primaries back to the sRGB triangle. Use it for web and SDR work. On a good monitor the clamp is accurate and leaves brightness controls unlocked; on a cheap one it may lock brightness or shift the white point, which is worth checking before you buy.

macOS has largely solved this at the OS level: it is color-managed end to end, so sRGB content is translated correctly on a P3 display. Windows is only partly color-managed — some apps honor the display profile, many do not — which is why Windows users notice oversaturation far more often. If you're on Windows with a wide-gamut panel, the hardware sRGB mode is the reliable answer, not a software profile.

Which one should you actually care about?

• General use, office, browsing: sRGB coverage only. Anything else is a bonus.
• Video and gaming, especially HDR: P3 coverage, alongside real contrast and brightness.
• Photo editing for screen delivery: high sRGB coverage plus low Delta E. See How to Set Up a Monitor for Photo Editing.
• Photo editing for print: Adobe RGB, and a hardware calibrator is no longer optional.

Test it yourself

Run the Color Test and Color Gradient Test to eyeball saturation and smoothness — and check whether an sRGB mode tames over-vivid color. Switch modes with the same image on screen; a real clamp visibly pulls the reds and greens back.

While you're there, run the Greyscale Test. A wide gamut is useless if the greys are tinted, and greyscale is where a bad white point shows up most clearly. If the steps look green or magenta, fix that first — How to Calibrate Your Monitor Without a Colorimeter covers what you can do by eye, and where the eye stops being good enough.