sRGB (shown above right), Adobe RGB (shown above left) and NTSC all have their own colour gamut (a subset of colours) and each can display a different amount of colours within the subset.
The international sRGB standard was prepared in 1998 by the International Electrotechnical Commission (IEC) and has established a firm position as the standard in Windows environments. In most cases, products like LCD monitors, printers, digital cameras, and various applications are configured to reproduce the sRGB color gamut as accurately as possible. By ensuring that the devices and applications used in the input and output of image data are sRGB compatible, discrepancies in colour between input and output are reduced. However, the range of colors that can be expressed using sRGB is narrow. In particular, sRGB excludes the range of highly saturated colours. For this reason, as well as the fact that advances in devices such as digital cameras and printers have led to widespread use of devices capable of reproducing colours more vivid than those allowed under the sRGB standard, the Adobe RGB standard and its wider colour gamut is now a popular choice.
Adobe RGB was defined in 1998 by Adobe Systems and while it's not an international standard like sRGB, it has become popular in professional colour imaging environments and in the print and publishing industries. In fact, many LCD monitors can reproduce most of the Adobe RGB color gamut now.
NTSC is a colour gamut developed by the National Television Standards Committee of the United States. While the range of colours that can be depicted under the NTSC standard is close to that of Adobe RGB, its R and B values differ slightly. The sRGB colour gamut covers about 72% of the NTSC gamut. While monitors capable of reproducing the NTSC colour gamut are required in places like video production sites, this is less important for individual users or for applications involving still images.
For more tips on colour gamut, take a look at the technique section
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