Updating picture paths
QuarkXPress uses two types of information for imported pictures: low-resolution and high-resolution. Low-resolution information is used to display picture previews. When you print, high-resolution information contained in the original picture files is accessed using paths to the pictures.
A path to a picture is established when you import a picture. The application keeps information about each picture’s path as well as when the picture was last modified.
If a picture is moved or changed after it is imported, the application warns you when you execute the Print command or the Collect for Output command (File menu).
Open Prepress Interface (OPI) systems substitute high-resolution images and pre-separate full color scanned images. If you are using such an output system, you can, for example, import a low-resolution RGB TIFF into a document, and specify that QuarkXPress automatically enter OPI comments so that the low-resolution pictures are swapped for high-resolution pictures when printing. OPI systems have different swapping capabilities.