A color gamut is the full set of colors a color space can represent. sRGB, the space nearly every image defaults to, was standardized in the 1990s around what CRT monitors could show. Display P3 takes the primaries from DCI-P3 — a cinema projection standard — and adapts them to the D65 white point most screens actually use. The result covers meaningfully more of the visible spectrum than sRGB, especially in saturated reds and greens.
Gamut is not dynamic range
How we actually detect it
We don't assume a P3 image based on file type. For JPEGs and PNGs, we look for a real embedded ICC color profile and check its actual primaries (the rXYZ/gXYZ/bXYZ tags) against known reference chromaticities — with a tolerance we calibrated against a real browser-generated ICC profile, not a guess. For AVIF, we check the file's CICP color metadata directly, which is more authoritative when it's present. If neither exists, we report the gamut as unconfirmed rather than assuming sRGB.
Can you actually see the difference?
Only if your screen supports it and the app showing the image respects the color profile (most modern browsers do). Our Display Test page includes real Display P3 swatches alongside a live check of whether your current browser reports P3 support — so you're looking at an honest answer specific to your setup, not a generic claim.