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How-To Geek

CMYK

Televisions, computer monitors, phone and tablet displays, and other display screens use RGB color (all the colors you see via that display are composed of tiny red, green, and blue pixels adjusted to varying degrees of intensity to create a wide range of potential colors). Another way of saying this is that computers and related equipment use an RGB color space.

Printers, both massive commercial ones and little home desktop ones, use a different color space. Printers use the CMYK (Cyan, Magenta, Yellow, and blacK) color space. While, according to color theory, you can combine cyan, magenta, and yellow to create every available color (including black), in practice prints made in this fashion have muddy blacks and thus modern print systems include a separate black ink cartridge to compensate for this.

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