Gamut Size
DCI-P3 is a color space created by the Digital Cinema Initiative (DCI) and has been widely adopted in the video and cinema world. P3 has similar chromaticities (end points) and color gamut to the AdobeRGB space widely used in graphic arts and photography. AdobeRGB’s gamut is a little larger in the blue/green area, and P3 expands further into red/yellow. Both are substantially larger than sRGB, which has historically served as a bit of a lowest common denominator for web imagery and is a good match to color gamut of many consumer-level displays.
Gamma
Apple has been promoting their own flavor of P3 called Display P3. All iPhones, iPads, iMacs, MacBooks, and Apple-branded external displays released since 2016 incorporate Display P3 into their screens. Whereas the original DCI-P3 specified a white point of 6300K, Display P3 uses a tad bluer 6500K, the same white point specified for AdobeRGB and sRGB. And whereas DCI-P3 specifies a very contrasty gamma of 2.6 (optimized for darkened movie theaters), Display P3 specifies the sRGB gamma, which is similar to 2.2.
