Adobe InDesign CS3 Bedienungsanleitung PDF herunterladen (Seite 417)

INDESIGN CS3

User Guide

410

Best practices when creating transparency

In most cases, flattening produces excellent results when you use an appropriate predefined flattener preset, or create

a preset with settings appropriate for your final output. For a complete reference and troubleshooting guide on how

transparency affects output, see the document “Achieving Reliable Print Output with Transparency” (English only)

on the Adobe website.

However, if your document contains complex, overlapping areas and you require high-resolution output, you can

achieve more reliable print output by following a few basic guidelines:

Important: If you’re applying transparency to documents intended for high-resolution output, be sure to discuss your

plans with your service provider. Good communication between you and your service provider will help you achieve the

results you expect.

Overprinting objects

Although flattened objects may look transparent, they are actually opaque and don’t allow other objects beneath

them to show through. However, if you don’t apply overprint simulation, the transparency flattener may be able to

preserve basic overprinting of objects when exporting to PDF or printing. In this case, recipients of the resulting PDF

file should select Overprint Preview in Acrobat 5.0 or later to accurately view the results of overprinting.

Conversely, if you apply overprint simulation, the transparency flattener provides a simulation of what the overprints

look like, and this simulation results in all opaque objects. In PDF output, this simulation converts spot colors to

process color equivalents. Therefore, Simulate Overprint should not be selected for output that will be color

separated later.

Spot colors and blending modes

Using spot colors with certain blending modes sometimes produces unexpected results. This is because InDesign

uses process color equivalents on-screen, but uses spot colors in print. In addition, isolated blending in an imported

graphic could create knockouts in the active document.

If you use blending, check your design periodically using Overprint Preview in the View menu. Overprint Preview

gives an approximation of how spot inks that overprint or interact with transparent objects will appear. If the visual

effect is not what you want, do any of the following:

• Use a different blending mode or no blending mode. Avoid these blending modes when working with spot colors:

Difference, Exclusion, Hue, Saturation, Color, and Luminosity.

• Use a process color where possible.

Blend space

If you apply transparency to objects on a spread, all colors on that spread convert to the transparency blend space

you’ve chosen (Edit > Transparency Blend Space), either Document RGB or Document CMYK, even if they’re not

involved with transparency. Converting all the colors results in consistency across any two same-colored objects on

a spread, and avoids more dramatic color behavior at the edges of transparency. Colors are converted “on the fly” as

you draw objects. Colors in placed graphics that interact with transparency are also converted to the blend space.

This affects how the colors appear on-screen and in print, but not how the colors are defined in the document.

Depending on your workflow, do one of the following:

• If you create documents for print only, choose Document CMYK for the blend space.

• If you create documents for web only, choose Document RGB.

• Ifyoucreatedocumentsforbothprintandweb,decidewhichismostimportant,andthenchoosetheblendspace

that matches the final output.

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Adobe InDesign CS3 Bedienungsanleitung Seite 417

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