Adobe InDesign CS3 Bedienungsanleitung PDF herunterladen (Seite 468)

INDESIGN CS3

User Guide

461

Avoid the need for trapping by eliminating the possibility of misregistration in your use of color. Prevent misregis-

tration by making sure that abutting process colors have common inks. For example, if you specify a dark purple

strokewithavividredfill,theywillbothcontainasignificantpercentageofmagenta.Thestroke’sandfill’scommon

magenta will print as a single area, so that if misregistration occurs in the other process inks, the magenta printing

plate will make any resulting gap hard to see.

See also

“About overprinting” on page 577

About automatic trapping

InDesign can trap color documents with its built-in trapping engine, and can also take advantage of the Adobe

In-RIP Trapping engine available on Adobe PostScript output devices that support Adobe In-RIP Trapping.

Both trapping engines calculate adjustments to the edges of both type and graphics. They apply trapping techniques

to different parts of a single object, even if text or an InDesign object overlaps several different background colors.

Trapping adjustments are made automatically, and you can define trap presets to address the requirements of specific

page ranges. You only see the effects of trapping on color separations generated by a trapping engine; you cannot see

the results on-screen within InDesign.

The trapping engine detects contrasting color edges, and then creates traps based on the neutral densities (lightness

or darkness) of abutting colors, in most cases by spreading lighter colors into adjacent darker colors. The trapping

settings you specify in the Trap Presets panel modify the trapping engine’s results.

Automatic trapping requirements

To trap documents using the InDesign built-in engine, you need a PPD that supports separations.

To trap documents using the Adobe In-RIP Trapping engine, you need the following software and hardware:

• An Adobe PostScript Level 2 or later output device that uses a RIP that supports Adobe In-RIP Trapping. To find

out if a PostScript output device supports Adobe In-RIP Trapping, contact the manufacturer or your prepress

service provider.

• A PPD (PostScript Printer Description) file for a printer that supports Adobe In-RIP Trapping. You must select

this PPD when you install the printer.

See also

“About PPD files” on page 550

Differences between built-in trapping and Adobe In-RIP Trapping

Composite color workflow With built-in trapping, you can separate a document by using InDesign or in-RIP

separations. To use Adobe In-RIP Trapping, you must use In-RIP separations.

Trap widths Built-in trapping limits trap widths to 4 points, regardless of the value you enter for the trap widths. For

larger trap widths, use Adobe In-RIP Trapping.

Vector EPS graphics Built-in trapping cannot trap placed vector EPS graphics; Adobe In-RIP Trapping traps all

imported graphics.

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