Samsung Galaxy S8 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 four Galaxy S8 Screen Modes along with the new wide DCI-P3 Standard Color Gamut marked by 3 Black circles. 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.

Accurate White Point
The circles in the center are the measured color of White for each of the Screen Modes along with the D65 Standard White, the color of natural daylight at noon, which is marked as a White circle. To deliver accurate image colors for standard consumer photo and video content the display must match both the Standard Color Gamut and the Standard Color of White.

Four Galaxy S8 Screen Modes
The Galaxy S8 has 4 user selectable Screen Modes. The AMOLED Cinema screen mode is an accurate match to the DCI-P3 Standard Gamut that is used for the new 4K UHD TV content. The Basic screen mode is an accurate match to the sRGB / Rec.709 Standard Gamut that is used to produce most current consumer content. The AMOLED Photo screen mode is an accurate match to the Adobe RGB Standard Gamut that is used with high-end digital cameras and advanced imaging applications. The Adaptive Display screen mode has the Widest Color Gamut and is intentionally Vivid.

See these Color Accuracy Figures for detailed measurements of each of the Screen Modes. Note that some of the Screen Modes are similar and their Gamuts and White Points overlap in the Figure. The white circle marking the D65 White Point is covered by the very accurate White Points for the AMOLED Cinema, Basic, and AMOLED Photo screen modes. The Adaptive Display screen mode has an intentionally Bluish White Point.

Figure 1a.   Screen Mode Color Gamuts in the Dark 0 lux Color Gamut for each of the Modes

The Change in Color Gamut with Ambient Light
Figure 1a above shows the Color Gamuts in 0 lux Ambient Light, which is perfectly dark. Figure 1b below shows the decrease in two Color Gamuts with increasing Ambient Light, up through 2,000 lux, which corresponds to typical outdoor daylight in shade. At 500 lux, which corresponds to typical office lighting, the on-screen Color Gamut for the Basic screen mode on the left has fallen to 86%. 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 75%, and at 2,000 lux the on-screen Color Gamut has fallen to 58%.

The way to improve the display color accuracy and performance in Ambient Light is to start with a larger Color Gamut, like the Adaptive Display screen mode, which is shown on the right compared to the Basic screen mode on the left. At 1,000 lux the Adaptive Display screen mode provides a much better match to the sRGB / Rec.709 Color Gamut than the Basic screen mode. So the Adaptive Display screen mode provides more accurate on-screen colors in moderate to high Ambient Lighting than the other calibrated Screen Modes, which are designed and calibrated for Low Ambient Light.


Figure 1b.   Basic Screen Mode in 0 to 2,000 lux Ambient Light Figure 1b.   Adaptive Display Screen Mode in 0 to 2,000 lux Ambient Light
Absolute Color Accuracy for the sRGB/Rec.709 Color Gamut Absolute Color Accuracy for the DCI-P3 Color Gamut
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Galaxy S8 Display Technology Shoot-Out Article
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