Adobe InDesign CS3 Bedienungsanleitung PDF herunterladen (Seite 469)

INDESIGN CS3

User Guide

462

Trapping imported bitmap images

Built-in trapping can trap bitmap images, such as photographs, to text and graphics. Bitmap images must be saved

using a purely pixel-based file format that supports the color requirements of commercial printing. PSD (Photoshop)

and TIFF are the most appropriate formats for commercial printing jobs; before using other formats, consult with

your prepress service provider.

If you’re using an Open Prepress Interface (OPI) server, verify that it creates for-position-only (FPO) images using

TIFF or PSD formats. If the images are TIFF or PSD, it may be possible to use built-in trapping, as long as you don’t

select any Omit For OPI options at output time. (Omit For OPI options are located in the Advanced section of the

Print dialog box when a PostScript printer is targeted.)

Note: The behavior and precision of trapping within an OPI workflow depends on many factors, such as the downsam-

pling method the OPI server uses to generate FPO images. For best results, consult with your OPI vendor for information

about integrating Adobe trapping solutions with the vendor’s OPI server.

Trapping imported vector graphics

Both Adobe In-RIP Trapping and built-in trapping can trap text and graphics created with InDesign tools, and

placed vector PDF files. However, built-in trapping cannot trap placed vector EPS graphics.

The text, paths, and frames you create in InDesign won’t trap correctly if they overlap a frame containing a placed

graphic that built-in trapping won’t trap, such as vector EPS graphics. (However, those objects will trap correctly with

Adobe In-RIP Trapping.) You may be able to use built-in trapping with documents containing vector EPS graphics

if you adjust the graphic’s frame. If the placed EPS graphic isn’t rectangular, try reshaping the frame closer to the

graphic itself, and away from other objects. For example, you might choose Object > Clipping Path to fit the graphics

frame more tightly around the graphic.

InDesign text and graphics that overlap placed EPS graphics (left) won’t trap correctly; to achieve good trapping, reshape the frame so that it

doesn’t touch other objects (right).

Trapping text

Both the Adobe In-RIP and built-in trapping engines can trap text characters to other text and graphics. (Built-in

trapping requires that the text and graphics are created with InDesign, and aren’t contained in imported graphics.)

A text character overlapping different background colors traps accurately to all of the colors.

Adobe In-RIP Trapping can trap all types of fonts. In contrast, built-in trapping works best with Type 1, Open Type,

and Multiple Master fonts only; using TrueType fonts may result in inconsistent traps. If your document must use

TrueType fonts and you want to use built-in trapping, consider converting all TrueType text to outlines by selecting

thetextandchoosingType>CreateOutlines.ThetextwillbecomeInDesignobjectsthattrapreliably.Textcan’tbe

edited after you convert it to outlines.

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Adobe InDesign CS3 Bedienungsanleitung Seite 469

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