Xiaomi Redmi K40 Pro Color Gamuts    
  Figure 1a   Color Gamuts in the Dark 0 lux
  Figure 1b   Color Gamuts in 0 to 2,000 lux

Figure 1a below shows the measured Color Gamuts for the Redmi K40 Pro along with the Standard sRGB / Rec.709 and DCI-P3 Color Gamuts. The outermost white curve is the limits of human color vision - the horseshoe is the pure spectral colors and the diagonal is the Line of Purples. A given display can only reproduce the colors that lie inside of the triangle formed by its Primary Colors.

Selectable Color Modes
The Redmi K40 Pro provides 3 user selectable Color Modes:
The Original Mode, which provides the most Accurate Colors with Automatic Color Management for ICC Content.
The Auto Mode, which has more Vibrant Colors and Contrast.
The Saturated Mode, which has the Native Wide Color Gamut of the OLED display.

Accurate White Points
The dots in the center are the measured color of White for each of the Color Gamuts along with the D65 Standard White, which is marked as a white circle. To deliver accurate image colors the display must match both the Standard Color Gamut and the Standard Color of White.

Accurate Color Gamuts
The Standard Color Gamuts are marked with Black and Gray dots in Figure 1a below.
The Original Mode DCI-P3 Color Gamut is an accurate match to the DCI-P3 Standard Color Gamut that is used to produce the new 4K UHD TV content. The Original Mode sRGB Color Gamut is an accurate match to the sRGB / Rec.709 Standard Color Gamut that is used for most existing consumer content.

Both of the Redmi K40 Pro Original Mode Color Gamuts are a close match to the Standard Gamuts.
See this Figure for detailed Absolute Color Accuracy measurements for each of the Color Gamuts.

Figure 1a.   Color Gamuts in the Dark 0 lux Color Gamuts

The Reduction in the Color Gamut with Ambient Light
Figure 1a above shows the Color Gamuts in 0 lux Ambient Light, which is absolute darkness.
Figure 1b below shows the reduction in the Color Gamut with increasing Ambient Light for the Saturated and Original Modes.

For the sRGB and DCI-P3 Original Modes:
At 500 lux, which corresponds to typical office lighting, the on-screen Color Gamut is reduced to 91%. At 1,000 lux, which corresponds to very bright indoor lighting or outdoor daylight with an overcast sky, the on-screen Color Gamut has fallen to 81%, and at 2,000 lux, which corresponds to typical outdoor daylight in shade, the on-screen Color Gamut has fallen to 63%.


Figure 1b.   sRGB Original Mode in 0 to 2,000 lux Ambient Light
The Gamut is reduced to 91% at 500 lux   81% at 1,000 lux   63% at 2,000 lux
Figure 1b.   DCI-P3 Original Mode in 0 to 2,000 lux Ambient Light
The Gamut is reduced to 91% at 500 lux   81% at 1,000 lux   63% at 2,000 lux
sRGB Original Mode in Ambient Light DCI-P3 Original Mode in Ambient Light

Figure 1b.   Saturated Mode in 0 to 2,000 lux Ambient Light
At 500 lux, which is typical bright indoor lighting, the Redmi K40 Pro Saturated Color Gamut shrinks
so that it is a better match to DCI-P3. At 2,000 lux the Saturated Mode is a better match to sRGB.
Saturated Mode Color Gamut in Ambient Light

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