Samsung Galaxy S10 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 Samsung Galaxy S10 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 Screen Modes
The Galaxy S10 provides 2 user selectable Screen Modes:
The Natural Mode, which provides the most Accurate Colors with Automatic Color Management for ICC Content.
The Vivid 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 Natural 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 Natural 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 Galaxy S10 Natural 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 Vivid and Natural Modes.

For the sRGB and DCI-P3 Natural Modes:
At 500 lux, which corresponds to typical office lighting, the on-screen Color Gamut is reduced to 88-89%. 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 77-78%, and at 2,000 lux, which corresponds to typical outdoor daylight in shade, the on-screen Color Gamut has fallen to 61-62%.


Figure 1b.   sRGB Natural Mode in 0 to 2,000 lux Ambient Light
The Gamut is reduced to 89% at 500 lux   77% at 1,000 lux   61% at 2,000 lux
Figure 1b.   DCI-P3 Natural Mode in 0 to 2,000 lux Ambient Light
The Gamut is reduced to 88% at 500 lux   78% at 1,000 lux   62% at 2,000 lux
sRGB Natural Mode in Ambient Light DCI-P3 Natural Mode in Ambient Light

Figure 1b.   Vivid Mode in 0 to 2,000 lux Ambient Light
At 500 lux, which is typical bright indoor lighting, the Galaxy S10 Vivid Mode Color Gamut shrinks
so that it is a better match to DCI-P3. At 1,000 lux the Vivid Mode is a better match to sRGB.
Vivid Mode Color Gamut in Ambient Light

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