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Adding spot colors (Photoshop)
Spot colors are special premixed inks used instead of, or in addition to, the process color (CMYK) inks. Each spot color requires its own plate on the press. (Because a varnish requires a separate plate, it is considered a spot color, too.) For information on printing spot color plates, see Printing color separations.
If you are planning to print an image with spot colors, you need to create spot channels to store the colors. To export spot channels, save the file in DCS 2.0 format or PDF. (See Saving files in Photoshop EPS format (Photoshop).)
Note: ImageReady supports Photoshop spot color channels as alpha channels.
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