It is most likely you will use CMYK files. If so, use DCS 1.0 or DCS 2.0 files. This file format was created by Quark an it works perfect in QuarkXPress. DCS 1.0 is suitable for all CMYK documents and it's probably the best choice for you. DCS 2.0 supports alpha channels and is good for multi-color documents (e.g. if you want to add silver, gold or PANTONE colors to your work). DCS is an EPS file and his name means "desktop color separations". Your file is color separated in Photoshop when you save the file and Quark will print these separation in seconds. While it's an EPS file, you can include vector data, halftone screen frequency, halftone screen shape and the image encoding (Binary or ASCII). The DCS can be also single or multiple file. If you select the multiple file option, this will create 5 (or more) files - one that holds the composite preview of the image and single files for every color or alpha channel in the image. The multiple file DCS is used for hudge images to improve printing speed.
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