CMYK are the inks they use to make the full range of colors. They also have CMYKOP (adding ornage and purple) or CMYKLtCLtM (adding light cyan and light magenta) to expand the gamut of colors that they can print. When printing on paper you are starting from white and adding inks to darken that white to whatever color you want. The exact opposite is the case on a TV screen where you start with Black and add Red Green and Blue light to make it lighter.
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