When preparing your image for prepress and
working with CMYK images or images with spot colors, you can print
each color channel as a separate page.

Each color channel printed as a separate page
Note: If
you are printing an image from another application and want to print
spot channels to spot color plates, you must first save the file
in DCS 2.0 format. DCS 2.0 preserves spot channels. This format
is supported by applications such as Adobe InDesign and QuarkXPress.