Adobe 65023809 Printing Guide - Page 30

Object Layer Options Layered graphics whose appearance is affected by Object Layer Options are indicated by a "Yes" in the Layer Overrides column. A number in parentheses indicates how many layers are affected. When performing any edits in Photoshop to a file using Layer Overrides, be mindful that your actions may affect multiple instances of the image. Don't delete any layers during edits-they may be needed in some instances of the image. Don't flatten the original source files for images affected by layer overrides. If your shop has historically advised flattening Photoshop layered files placed in InDesign, be sure to advise customers and staff not to flatten when layer overrides are used. Maintain the layer names, stacking order, and layer comp definitions in each layered source file unless you need to alter the file. When these layering attributes are altered in the original file after layer overrides are applied in InDesign, the link becomes invalid in InDesign and the appearance of the file may change when the link is updated. This does not create an output issue if the resulting changes in appearance are intentional. The Layer Options dialog box offers the choice of honoring InDesign's overrides when updating a graphic or "starting over" with the saved file's layer visibility settings. Even if you choose to honor InDesign's overrides when updating, any new layers you've added will automatically be visible. Raster-based Photoshop DCS and EPS files Desktop Color Separation (DCS) files may still be used by some customers who need to include spot color plates in their color images. Because DCS files are pre-separated, it can be a challenge to integrate them into some prepress workflows. InDesign CS4 automatically merges DCS 2.0 files created from Adobe Photoshop during printing or export, so it's easier to reuse legacy files. These enhancements are made possible because InDesign reads Photoshop DCS and EPS files as images. Reading these file types as images yields another benefit: Photoshop EPS files can be color-managed if an ICC profile was embedded. For an EPS or DCS file to benefit from these enhancements in Adobe InDesign CS4, the file must meet the following requirements: • The file must be created by Photoshop. • The file must be an 8-bit file. The CMYK, RGB, and gray color models are supported. It can include spot colors, and it can be a multitone file (such as a duotone). • A DCS file must not be saved with the Include Vector Data option selected. (Clipping paths are supported without this option selected.) • DCS files must conform to the DCS 1.0 or 2.0 specification. EPS and DCS files (such as copy-dot scans) not meeting these requirements can still be placed, but they won't benefit from the enhanced workflow in InDesign. You can also elect to open DCS files in Photoshop and resave them as native Photoshop (.psd) files, and then replace the DCS files in InDesign. Unlinking and relinking placed text files Unlike placed graphics files, placed text files are always completely included in the document so that the text can be edited freely in InDesign. By default, text files are not linked to a source file, although that preference can be changed. If text files are placed as linked files, and are marked as missing in the Links panel or Preflight dialog box, it poses no problems for high-resolution printing because the text is completely included in the document. Placed text stories can be unlinked from their source files using the Links panel. Unlinking causes InDesign to stop tracking the source text files. If a customer uses a workflow where text is only edited and formatted within Adobe InDesign after it's placed, unlinking text files prevents Adobe Creative Suite 4 Printing Guide 28