“The human eye’s desire for color is infinite. Photographers often rush in nature in pursuit of better scenery and rich colors, just to show this color in front of the viewer. And can everyone really see that color completely? This is hard to say, because the quality of the picture you get depends entirely on the quality of your device’s screen, in other words, the “color gamut” that manufacturers often refer to.
The human eye’s desire for color is infinite. Photographers often rush in nature in pursuit of better scenery and rich colors, just to show this color in front of the viewer. And can everyone really see that color completely? This is hard to say, because the quality of the picture you get depends entirely on the quality of your device’s screen, in other words, the “color gamut” that manufacturers often refer to.
The term color gamut is a method of encoding colors, and also refers to the sum of colors that can be produced by a technical system. Simply put, it is the area that can be covered in color. The color gamut standard for the range of colors visible to the human eye has been established internationally, which is the CIE1931 color gamut chromaticity diagram.
The color range that the human eye can recognize CIE1931
We can often see xx%NTSC, xx%sRGB and other parameter propaganda in mobile phone conferences or promotional pages. In fact, it’s not just that the larger the number, the better. The meaning of the letters in front is very important, and some friends actually don’t know what those letters represent.
Our common color gamut standards on mobile phones can be divided into sRGB, NTSC, and the DCI-P3 color gamut that has been promoted by the mobile phone industry as a standard in the film industry in recent years.
sRGB (standard Red Green Blue) is a color language protocol jointly developed by Microsoft imaging giants. Microsoft, together with Epson, HP, etc., provides a standard method to define colors, allowing various computer peripherals such as Display, printing, and scanning to interact with Application software has a common language for color.
As one of the earliest color gamut standards, the display’s ability to restore colors was limited at that time. The color space was only about one-third of the standard CIE1931 area. The little coverage of green would lead to color expression in scenes such as flowers, grass, forests, etc. Insufficient, we will compare later.
The mobile phone industry has been able to easily control the 100% sRGB color gamut standard a few years ago.
NTSC is the National Television Standards Committee (United States). It is responsible for the development of a set of U.S. standard television broadcast transmission and reception protocols. It supports 24 bit depth and can express approximately 16.7 million different colors. Compared with sRGB, the green area is wider.
Nowadays, most of our common mobile phones have already used OLED panels, which also enables the general mobile phones to support more than 100% NTSC color gamut.
This is a color gamut standard used in theaters. It can match most colors in theaters. It is above the Rec.709 standard and has more red and green color ranges, which can fully cover the current international standards of high-definition television.
Most of the application scenarios of mobile phones are watching video and movies. Supporting this color gamut standard is undoubtedly a great boon for audio-visual enthusiasts, and as the application of video HDR technology to mobile phones becomes more and more common, supporting P3 color gamut can also enable watching movies. The effect has improved.
There has always been a saying that 100%sRGB=72%NTSC, which shows that the NTSC standard is greater than sRGB.
Real shot comparison
Some mobile phones support multiple color gamut standards for users to choose from at a time, and the options here are not obvious except that the screen tone is obviously cold or warm. This time we chose an example of OnePlus 6T that supports both sRGB and DCI-P3 color gamuts to compare the look and feel of the two color gamuts.
Left: sRGB, right: DCI-P3
Left: sRGB, right: DCI-P3
Left: sRGB, right: DCI-P3
It can be clearly seen that for the green part of the hair color, the DCI-P3 color gamut standard is more natural and beautiful, and the red saturation is also higher. The sRGB side looks much dim overall. It’s the same principle. The larger the color gamut coverage area, the more complete the colors displayed, and the more abundant the same sense.
The wider the color gamut is supported, the more accurate the color restoration will be. Of course, due to different color gamut standards used by different authors and fields, this will result in a slight deviation from the original author’s color when viewing with a single color gamut monitor, and it will also cause the display to become yellow or red. , This is the need for color management to match the relative color display effects of different color gamuts. Generally, the nearly 100% NTSC color gamut supported by the mobile phone industry can meet people’s demand for natural colors. Choosing the corresponding color gamut effect according to different movie environments can also get more beautiful and restored colors.