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Yellow is the color evoked by light that stimulates both the L and M (long and medium wavelength) cone cells of the retina about equally, but does not significantly stimulate the S (short-wavelength) cone cells; that is, light with much red and green but not very much blue.[2] Light with a wavelength of 570-580 nm is yellow, as is light with a suitable mixture of somewhat longer and shorter wavelengths. Yellows traditional RYB complementary color is purple, violet or indigo. Yellows colorimetrically defined complementary color in both RGB and CMYK color spaces is blue.