Most LCD monitors, printers, cameras and various other applications are configured to reproduce the sRGB colour gamut as accurately as possible. This means that photographers can reduce discrepancies in colour between input and output by checking that all devices and applications used are sRGB compatible.
However, a quick look at the diagram will show that the range of colours displayed in sRGB is much narrower than the other two options. For this reason, as well as the fact that more devices are now capable of producing colours which are much more vivid than those under the sRGB standard, Adobe RGB is now very popular. Adobe RGB has a wider colour gamut and it has the ability to express more vivid greens. As a result many monitors can reproduce most of the Adobe RGB color gamut. The EIZO ColorEdge CG276, for example, gives you the options of working in sRGB or Adobe RGB alongside other modes all of which can be accessed via the buttons on the front of the monitor.
NTSC is a standard that's less important for individual users or for applications involving still images. The main concerns for those working with images is that an LCD monitor must be sRGB compatible and have the capacity to reproduce the Adobe RGB color gamut.
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