In color printing, yellow is one of the three subtractive primary colors of ink along with magenta and cyan. Together with black, they can be overlaid in the right combination to print any full color image. A particular yellow is used, called Process yellow (also known as "pigment yellow", "printer's yellow", and "canary yellow"). Process yellow is not an RGB color, and there is no fixed conversion from CMYK primaries to RGB. Different formulations are used for printer's ink, so there can be variations in the printed color that is pure yellow ink.
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