Adobe InDesign CS3 Manual de usuario descargar pdf (Pagina 581)

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Chapter 21: Color separations

To produce high-quality separations, it helps to be familiar with the basics of printing, including line screens,

resolution,processcolors,andspotcolors.Ifaprintserviceproviderisproducingyourseparations,workcloselywith

them before beginning each job.

Preparing to print separations

Creating separations

To reproduce color and continuous-tone images, printers usually separate artwork into four plates—one plate for

each of the cyan (C), yellow (Y), magenta (M), and black (K) portions of the image. When inked with the appropriate

color and printed in register with one another, these colors combine to reproduce the original artwork. The process

of dividing the image into two or more colors is called color separating, and the films from which the plates are

created are called the separations.

Composite (left) and separations (right)

Separation workflows

Adobe InDesign CS3 supports two common PostScript workflows; the main difference is where separations are

created—at the host computer (the system using InDesign and the printer driver), or at the output device’s RIP (raster

image processor). Another alternative is a PDF workflow.

Host-based separations In the traditional host-based, preseparated workflow, InDesign creates PostScript infor-

mation for each of the separations required for the document, and sends that information to the output device.

In-RIP separations In the newer RIP-based workflow, a new generation of PostScript RIPs performs color separa-

tions,trapping,andevencolormanagementattheRIP,leavingthehostcomputerfreetoperformothertasks.This

approach takes less time for InDesign to generate the file, and minimizes the amount of data transmitted for any

given print job. For example, instead of sending PostScript information for four or more pages to print host-based

color separations, InDesign sends the PostScript information for a single composite PostScript file for processing in

the RIP.

For a video on preparing files for output, see www.adobe.com/go/vid0089. To view a printing guide for prepress

providers (PDF), see www.adobe.com/go/learn_id_prepress_wp.

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Adobe InDesign CS3 Manual de usuario Pagina 581

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