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A print overlay is prepared for each color, and is used to make the plate, which is linked to its color in the press. Ink is added to the packaging surface by the image areas in each plate, and rejected in non-image areas.
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What is the purpose of color separation? CMYK printing is also called the colour separation or four-colour-process. The colours are individually applied, starting with black, and then the rest of the process colours are applied in the order- cyan, magenta and yellow. In both offset and flexography the popular printing methods, each colours is applied or printed one at a time to produce the desired end colour. Digital images are in RGB, and have to be converted to CMYK through software to make separate plates to produce prints.