Green (G) is one of three primary colors of additive color mixing and a secondary color of subtractive color mixing. In the CIE color space, green has a wavelength between 520 nm and 560 nm, which corresponds to frequencies from 535 THz to 575 THz.
Green can have different wavelengths for additive color mixing. This is related to the requirement for the largest possible color space for additive color mixing of red, green, blue( RGB) and to the requirement that the third primary color cannot be created from two primary colors. These requirements are fulfilled by several wavelengths, but are always to be seen in connection with the other two primary colors.
Internationally, green has a wavelength of 546 nm.
The various color models define the color green in the CIE color space slightly differently from each other. For example, the EBU has defined the xy coordinates for green as 0.30/0.60, whereas in NTSC the coordinates are 0.21/0.71. In standard RGB( sRGB), green is specified in the CIE color space with the coordinates 0.3000/0.6000.