Converting RGB to CMYK
Unless you and your print service provider are working in a color-managed workflow, you’ll be expected to provide CMYK images (except, of course, those images intended to print as grayscale or duotone). Ideally, you’ll be given conversion settings customized for their presses, as well as instructions on applying those settings. Lacking that, you should find that Photoshop’s built-in conversion settings are serviceable. Choose Edit > Color Settings and then select North America Prepress 2, or use the custom settings provided by your print service provider.
Photoshop invokes these settings when you select Image > Mode > CMYK Color or Image > Mode > Grayscale. Keep this in mind if your print service provider gives you high-resolution ...
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