What Is sRGB?
sRGB stands for Standard Red Green Blue. It is the color space established in 1996 by HP and Microsoft as a common reference for monitors, printers, the internet, and consumer cameras. Nearly every display sold today and every piece of content published online uses sRGB as its baseline.
When your monitor is set to sRGB mode and your operating system is configured for sRGB output, colors appear consistent. A photo that looks correct on your phone will look the same on your monitor and on someone else's screen.
Why sRGB Was Created
Before sRGB, monitors varied widely in how they displayed color. A red that looked warm on one screen could appear orange on another. Printers could not reliably match what you saw on screen.
In 1996, the IEC (International Electrotechnical Commission) standardized sRGB as a reference color space. It defined exact chromaticity coordinates for red, green, and blue primaries, a white point (D65, equivalent to daylight), and a gamma curve of approximately 2.2.
How Wide Is sRGB?
The sRGB color space covers about 35% of all the colors visible to the human eye (as plotted on the CIE 1931 chromaticity diagram). That sounds small, but it includes all the colors that appear in most photographs, web graphics, and video content.
Wider color spaces like DCI-P3 (45% of visible colors) or Adobe RGB (50%) cover more vivid reds and greens. These are used for cinema, professional photography, and HDR content.
| Color Space | Coverage of Visible Colors | Primary Use |
|---|---|---|
| sRGB | 35% | Web, Windows, consumer content |
| DCI-P3 | 45% | HDR video, cinema, Apple devices |
| Adobe RGB | 50% | Professional photography, print |
| Rec. 2020 | 75% | Future HDR broadcast standard |
sRGB on Monitors: What the Percentages Mean
When a monitor advertises "99% sRGB" or "100% sRGB," it means the monitor can reproduce that percentage of all the colors defined in the sRGB standard. 100% sRGB means full coverage. 72% sRGB, common on cheap TN panels, means the monitor cannot display about a quarter of sRGB colors.
Higher sRGB coverage is better for general use. However, coverage is not the same as accuracy. A monitor can cover 100% sRGB but still display colors inaccurately due to calibration drift, gamma errors, or color temperature issues.
sRGB Mode vs Wide Gamut Mode
Modern wide gamut monitors cover DCI-P3 or Adobe RGB in addition to sRGB. This creates an important setting choice:
For web browsing, gaming, and everyday use, sRGB mode is the right choice. For color-managed professional work, wide gamut mode with application-level color management is appropriate.
Does Windows Support sRGB Color Management?
Windows supports ICC color profiles, which can tell applications the correct color space for the monitor. However, not all Windows applications are color-managed. Chrome and Firefox are, as are Photoshop and Lightroom. Many games are not.
For games and non-color-managed applications, having your monitor in sRGB mode is more reliable than relying on Windows color management.
sRGB Gamma: The 2.2 Curve
sRGB uses a gamma curve of approximately 2.2. Gamma describes the relationship between the numerical value of a pixel and its brightness on screen. A pure 2.2 gamma curve means midtones are reproduced at a predictable brightness relative to highlights and shadows.
If your monitor's gamma is set incorrectly (e.g., 2.0 or 2.4), shadow detail, highlight detail, and midtone contrast will look wrong, even if colors are otherwise accurate. Most monitor calibration tools check gamma alongside color.
Checking Your Monitor's sRGB Accuracy
The ScreenLab Color Accuracy Test lets you verify whether your monitor's color output looks correct by comparing reference patches. For precise measurement, you need a hardware colorimeter (like the Calibrite Display SL or Datacolor Spyder).
A well-calibrated consumer monitor should have: