Open prepress interface

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Open Prepress Interface ( OPI ) is a universal interface protocol for prepress . It allows the use of so-called OPI servers.

The high-resolution and therefore very memory-intensive image is greatly reduced in resolution by a powerful computer and saved separately - typically in a subfolder "layouts", in the same folder with the ending ".lay" or on its own FPO drive (FPO = for positioning only ). There are thus two versions of the image, a so-called HiRes image (high resolution = high resolution) or fine image and a LoRes image (low resolution = low resolution) or coarse image.

The low-resolution image is integrated into a desktop publishing system such as QuarkXPress or Adobe InDesign instead of the very memory-intensive image, in order to enable more fluid work. The OPI server automatically replaces the low-resolution image with the original image during the subsequent printout .

The most widely used implementation corresponds to the 1993 OPI 1.3 specification by Steve Carlson, Aldus Corporation (later acquired by Adobe Systems). The latest OPI specification OPI 2.0 is available from Adobe.

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