When you send color work to a service bureau or printing shop, either you or the service bureau must create color separations.
Color separations are necessary because a typical printing press applies only one color of ink at a time to a sheet of paper. A color separation is created by first isolating each color element in a print job. Each color element is then used to create a sheet of film or plate. Each sheet of film or plate is used to apply one color of ink to the sheet of paper.
Printing presses produce color using either process color or spot colors. The number of colors you plan to use is the main factor in deciding which method to use.
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