Bedienungsanleitung Adobe InDesign CC - 2015 (Seite 631 von 649) (Englisch)

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Printing

Last updated 11/30/2015

The trapping engine derives the ND values for a spot color from its CMYK equivalent. For most spot colors, the ND

values of their CMYK equivalents are accurate enough for proper trap creation. Spot inks that aren’t easily simulated

using process inks, such as metallic inks and varnishes, may need their ND values adjusted so that the trapping engine

can trap them correctly. By typing new values, you can ensure that an ink that is observably darker or lighter is

recognized that way by the trapping engine; the appropriate trap placement is then applied automatically.

You can get the appropriate neutral density value for a given ink by asking your commercial printer. The most accurate

method of determining an ink’s ND value is by measuring a swatch of the ink with a commercial densitometer. Read

the “V” or visual density of the ink (don’t use process filters). If the value differs from the default setting, type the new

value in the ND text box.

Note: Changing the neutral density for a spot color affects only how that color will trap. It doesn’t change the appearance

of that color in your document.

Follow these guidelines when adjusting ND values:

Metallic and opaque inks Metallic inks are usually darker than their CMYK equivalents, while opaque inks obscure

any ink beneath them. In general, you should set the ND values for both metallic and opaque spot colors much higher

than their default values to ensure that these spot colors won’t spread.

Note: Setting an ink to Opaque or Opaque Ignore in the Type menu of the Ink Manager prevents an opaque ink from

spreading into other colors, unless another opaque ink has a higher ND value.

Pastel inks These inks are normally lighter than their process equivalents. You may want to set the ND value for these

inks lower than their default values to ensure that they spread into adjacent darker colors.

Other spot inks Some spot colors, such as turquoise or neon orange, are significantly darker or lighter than their

CMYK equivalents. You can determine whether this is the case by comparing printed swatches of the actual spot inks

to printed swatches of their CMYK equivalents. You can adjust the spot ink’s ND value higher or lower as necessary.

Customize trapping for specialty inks

Using certain inks involves special trapping considerations. For example, if you are using a varnish on your document,

you don’t want the varnish to affect trapping. However, if you’re overprinting certain areas with a completely opaque

ink, you don’t need to create traps for items underneath. Ink options are available for these situations. It’s usually best

not to change the default settings, unless your prepress service provider recommends changing them.

Note: The speciality inks and varnishes used in the document may have been created by mixing two spot inks or by mixing

a spot ink with one or more process inks.

1 Open the Ink Manager and select an ink that requires special treatment.

2 For Type, choose one of the following options, and then click OK:

Normal Use for traditional process inks and most spot inks.

Transparent Use for clear inks to ensure that underlying items trap. Use this option for varnishes and dieline inks.

Opaque Use for heavy, nontransparent inks to prevent trapping of underlying colors but allow for trapping along

the ink’s edges. Use this option for metallic inks.

Opaque Ignore Use for heavy, nontransparent inks to prevent trapping of underlying colors and to prevent trapping

along the ink’s edges. Use this option for those inks, such as metallics and varnishes, that have undesirable

interactions with other inks.

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