Figure 2a Reference Colors
Figure 2b iPad mini 4 Absolute Color Accuracy
Figure 2c iPad Air 2 Absolute Color Accuracy
Figure 2d iPad Pro Absolute Color Accuracy
Reference sRGB / Rec.709 Colors
Uniform Color Diagrams and Reference 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. The 1 JNCD and 3 JNCD sizes are 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.
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.
The colors in Figure 2a have been accurately calculated to show the real colors within the sRGB / Rec.709 Gamut.
The colors shown in most published Color Gamuts are wildly incorrect.
Figure 2b. iPad mini 4 Absolute Color Accuracy Plot
Figure 2c. iPad Air 2 Absolute Color Accuracy Plot
Figure 2d. iPad Pro Absolute Color Accuracy Plot