A gamut is the complete range of colors that a device, system, or process can produce or represent. Your monitor has a gamut, your printer has a gamut, and your phone’s camera has a gamut. None of them can reproduce every color the human eye can see, so the gamut defines which slice of visible color each one covers.
How Gamut Works
Think of all the colors humans can perceive as a large, irregularly shaped map. Scientists charted this in 1931 as the CIE chromaticity diagram, which represents the full extent of human color vision. Every display, printer, or color standard carves out a smaller territory within that map. That territory is its gamut.
On a display, gamut is defined by three primary colors: red, green, and blue. The specific shades of red, green, and blue a screen can produce form the corners of a triangle on the color map. Every color the screen can show falls inside that triangle. A wider triangle means a wider gamut, which means more of the colors you see in real life can appear on screen. A narrow triangle means certain vivid or deeply saturated colors simply can’t be displayed and get replaced by the closest available alternative.
Gamut vs. Color Depth
These two concepts are easy to confuse but describe different things. Gamut is the range of colors a device can show. Color depth (or bit depth) is the number of distinct steps between those colors. A typical 8-bit display uses 256 levels per primary color, producing about 16.8 million possible combinations. But those 16.8 million colors are all drawn from within the display’s gamut. A screen with more bit depth can show smoother gradients and finer transitions, but it still can’t show colors outside its gamut. More bits means more distinct colors within a range that the gamut defines.
Common Color Gamut Standards
Several standardized gamuts exist because different industries need different color ranges. Here’s how the major ones compare, measured by how much of the full CIE 1931 visible color diagram they cover:
- sRGB (Rec. 709): 35.9% of visible color. This is the default standard for the web, most consumer monitors, and standard-definition video. It’s the smallest common gamut, which is why colors designed in sRGB tend to look consistent across devices.
- Adobe RGB: 52.1% of visible color. Developed for photography and print professionals, it extends significantly into greens and cyans that sRGB can’t reach. A monitor covering 100% of sRGB only covers about 72% of Adobe RGB.
- DCI-P3: 53.6% of visible color. Originally defined in 2005 for digital cinema projection in darkened theaters, this gamut has become the new mainstream target. Apple adopted a variant called Display P3 for its devices starting with the iPhone 7, and the Ultra HD Premium specification requires TVs to cover at least 90% of DCI-P3.
- Rec. 2020: 75.8% of visible color. The standard for next-generation HDR content, covering roughly twice the area of sRGB. No consumer display fully covers Rec. 2020 yet, but it serves as the target for future hardware.
Why Gamut Matters for Screens
The display technology in your screen directly affects how much of a given gamut it can reproduce. Premium IPS LCD panels typically cover 90 to 95% of the DCI-P3 gamut. OLED screens do better because each pixel emits its own light rather than filtering a backlight, so flagship OLED displays reach 95 to 100% of DCI-P3. That difference is most visible in rich reds, deep greens, and saturated blues.
For everyday browsing and office work, full sRGB coverage is plenty. If you edit photos, work in video production, or simply want movies and HDR content to look their best, a display covering a high percentage of DCI-P3 is worth seeking out. Netflix, for example, requires HDR deliverables to use P3-based primaries.
Gamut in Printing
Printers use a fundamentally different color model than screens. Displays mix red, green, and blue light (RGB), while printers layer cyan, magenta, yellow, and black ink (CMYK). Because ink on paper absorbs light rather than emitting it, a printer’s gamut is smaller than a monitor’s. The gap is most obvious with bright, vivid colors. Neon greens, electric blues, and saturated oranges that look stunning on screen often can’t be reproduced in standard CMYK ink.
This is why a photo or design can look noticeably duller when printed. The colors that fall outside the printer’s gamut have to go somewhere, and how they’re handled depends on the rendering intent your software uses.
What Happens to Out-of-Gamut Colors
When a color in your file falls outside what a device can produce, the device has to substitute something. Color management systems handle this through four main approaches:
- Perceptual: Compresses all the colors in an image so they fit within the device’s gamut while preserving the visual relationships between them. No single color is perfectly accurate, but the overall image looks natural. This is the go-to choice for photographs.
- Saturation: Replaces out-of-gamut colors with the nearest available color and boosts the vividness of in-gamut colors. Good for charts, graphs, and business graphics where vibrancy matters more than accuracy.
- Relative colorimetric: Swaps out-of-gamut colors for the nearest in-gamut match but leaves everything else untouched. Colors that the device can already reproduce stay exactly as specified.
- Absolute colorimetric: Works like relative colorimetric but also adjusts for the color of the paper or media itself. Useful for proofing, where you want to simulate exactly how a print will look on a specific paper stock.
Practical Takeaways
If you’re buying a monitor, the gamut coverage percentage tells you more about color quality than raw resolution does. A 4K display with only 60% sRGB coverage will look washed out compared to a 1080p panel hitting 100% sRGB. Look for the specific gamut standard being referenced, because “95% coverage” means very different things depending on whether it’s measured against sRGB or DCI-P3.
If you design for print, always check how your colors translate from RGB to CMYK before sending files to a printer. Most design software can preview out-of-gamut colors, flagging the ones that will shift when printed. Catching these early saves you from surprises when the final product arrives looking less vibrant than it did on screen.
If you shoot photos or video, your camera’s gamut setting determines how much color data gets captured. Shooting in a wider gamut like P3 preserves more color information for editing, but those files need a wide-gamut display to preview accurately. On a standard sRGB monitor, wide-gamut content can look oversaturated or shifted unless your software is color-managed.