Reference sRGB / Rec.709 Colors
All figures are plotted on a CIE 1976 Uniform Color Diagram. Note that the older 1931 CIE Diagrams that are frequently published are highly non-uniform and meaningless for Color Accuracy.
Absolute Color Accuracy Plots
Figure 2b below shows the measured on-screen colors for the 21 Reference Colors as displayed on the Surface Pro 3. The Reference Colors are all shown as Black circles and the measured Colors for the Surface Pro 3 are shown as Red circles. Color Errors smaller than the appropriate JNCD are not visually noticeable. The 1 JNCD and 3 JNCD Errors are discussed next and are shown in the Figures below.
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.
Any Display Color Error less than 3 JNCD is not visually noticeable and appears perfectly accurate to the eye.
Note that Complementary Colors lie directly across from one another through the White Point.
The 50% Saturated Colors are midway between White and the 100% Saturated Colors.
Figure 2b. Surface Pro 3 Absolute Color Accuracy Plot