Figure 2a Reference Colors
Figure 2b sRGB Content Color Accuracy
Figure 2c DCI-P3 Content Color Accuracy
We measure the Absolute Color Accuracy of the display with our proprietary sets of 41 Reference Colors for each Standard Color Gamut. The results are plotted on CIE 1976 Uniform Color Diagrams for each Gamut below.
41 Reference Colors for the wide DCI-P3 Color Gamut Standard
We have accurately calculated the Colors and Reference Colors for each of the Pixel 4 XL Standard Color Gamuts: DCI-P3 and RGB / Rec.709. The colors in Figure 2a have been calculated to show the true colors within the DCI-P3 Color Gamut -- the colors shown in most published Color Gamuts are wildly incorrect. For an in-depth discussion and analysis of all the Standard Color Gamuts see this article.
Note that in order to see the true DCI-P3 colors in Figure 2a your display must support the DCI-P3 Color Gamut - if not then you will instead see the color saturation range that your display can produce, which in most cases will be lower than DCI-P3.
Note that Complementary Colors lie directly across from one another through the White Point.
The 4 sets of triangles are the 25% 50% 75% and 100% Saturated Colors.
Uniform Color Diagrams
Note that the older 1931 CIE Diagrams that are published by many reviewers
with (x,y) color coordinates
are highly non-uniform and are meaningless for Color Accuracy.
Also the still widely referenced NTSC Color Gamut is from 1953 and has been
obsolete for over 30 years so it is also meaningless for specifying the
current Color Gamuts now in use.
Absolute Color Accuracy Plots
Reference Colors and Measured Colors
Just Noticeable Color Difference JNCD
Color differences less than 1 JNCD are visually indistinguishable, while values greater than 1 JNCD are visually noticeable when the two colors are touching on-screen. When the colors are not touching and are further apart, the visual threshold for Just Noticing a Color Difference is higher. Here we will use 3 JNCD for the threshold of a visually noticeable display color difference in images. The 3 JNCD color difference is shown in the Figures below.
Any Display Color Error less than 3 JNCD on a display is not visually noticeable and appears perfectly accurate to the eye. For an in-depth discussion and analysis of Absolute Color Accuracy see this article.
Color Shifts with Average Picture Level APL
The Pixel 4 XL provides a very accurate color match to the sRGB / Rec.709 Standard Color Gamut.
The Average Color Error is 0.5 JNCD and the Maximum Color Error is 2.1 JNCD.
Figure 2c. DCI-P3 Natural Mode Absolute Color Accuracy Plot