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Chapter 23. Print > To choose trapping values for an object (Trap Information p...

To choose trapping values for an object (Trap Information palette):

1.
Choose View > Show Trap Information to open the palette (Option-F12 in the Mac OS) .

Figure 1. This is the Trap Information palette with a picture box selected. In this example, the Background color of the picture box (20% Black) defaults to a spread trap of the Auto Amount over the darker color underneath.


2.
Select the item to which you want to apply trapping.

3.
Choose a new trap setting from the pop-up menu on the left side of the palette (the options will vary depending on the type of item chosen) :

Default to have the settings in Trapping tab preferences or Edit Trap Specifications be used to determine how colors will trap.

Overprint to have the foreground item color overprint any background color.

Knockout to have the foreground item color knock out any background color.

Auto Amount (+/-) to use the auto spread/auto choke value for the foreground color. Auto Amount settings are established in the Edit > Preferences > Preferences > Document–Trapping.

Custom to enter a custom spread or choke (negative) value for the foreground color.

TIP

Choosing Overprint from the palette will cause that item to overprint, regardless of the foreground or background color shade or the Overprint Limit value.



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