This is what they say about basic screen mode on the S6.
Basic Screen Mode with the Standard sRGB / Rec.709 Color Gamut
The Basic screen mode provides a very accurate Color and White Point calibration for the Standard sRGB/Rec.709 Color Gamut that is used to produce virtually all current consumer content for digital cameras, HDTVs, the internet, and computers, including photos, videos, and movies. The Color Gamut of the Basic screen mode is very accurate, with a nearly perfect 101 percent of the Standard sRGB/Rec.709 Color Gamut. Even better, the Absolute Color Accuracy for the Basic screen mode is an impressive 1.6 JNCD, tied with the Galaxy Note 4 for the most color accurate display that we have ever measured for a Smartphone or Tablet. It is visually indistinguishable from perfect, and very likely considerably better than your living room TV or any display that you own. See this Figure for an explanation and visual definition of JNCD and the Galaxy S6 Color Accuracy Plots showing the measured display Color Errors, our Absolute Color Accuracy Comparison of the leading Smartphones, and also this regarding Bogus Color Accuracy Measurements.
Use the Basic screen mode for the best color and image accuracy, which is especially important when viewing photos from family and friends (because you often know exactly what they actually should look like), for some TV shows, movies, and sporting events with image content and colors that you are familiar with, and also for viewing online merchandise, so you have a very good idea of exactly what colors you are buying and are less likely to return them. See the Color Accuracy section and the Color Accuracy Plots for measurements and details.
Basic Screen Mode with the Standard sRGB / Rec.709 Color Gamut
The Basic screen mode provides a very accurate Color and White Point calibration for the Standard sRGB/Rec.709 Color Gamut that is used to produce virtually all current consumer content for digital cameras, HDTVs, the internet, and computers, including photos, videos, and movies. The Color Gamut of the Basic screen mode is very accurate, with a nearly perfect 101 percent of the Standard sRGB/Rec.709 Color Gamut. Even better, the Absolute Color Accuracy for the Basic screen mode is an impressive 1.6 JNCD, tied with the Galaxy Note 4 for the most color accurate display that we have ever measured for a Smartphone or Tablet. It is visually indistinguishable from perfect, and very likely considerably better than your living room TV or any display that you own. See this Figure for an explanation and visual definition of JNCD and the Galaxy S6 Color Accuracy Plots showing the measured display Color Errors, our Absolute Color Accuracy Comparison of the leading Smartphones, and also this regarding Bogus Color Accuracy Measurements.
Use the Basic screen mode for the best color and image accuracy, which is especially important when viewing photos from family and friends (because you often know exactly what they actually should look like), for some TV shows, movies, and sporting events with image content and colors that you are familiar with, and also for viewing online merchandise, so you have a very good idea of exactly what colors you are buying and are less likely to return them. See the Color Accuracy section and the Color Accuracy Plots for measurements and details.
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