Adobe Illustrator CS3 User Manual download pdf (Page 432)

ILLUSTRATOR CS3

User Guide

426

2 Select Advanced on the left side of the Print dialog box.

3 Select Simulate or Discard from the Overprints menu.

Trapping

About trapping

Where colors printed from separate plates overlap or adjoin one another, press misregistration can cause gaps

between colors on

the final output. To compensate for potential gaps between colors in artwork, print shops use a

technique called trapping to create a small area of overlap (called a trap) between two adjoining colors. You can use

a separate, dedicated trapping program to create traps automatically, or you can use Illustrator to create traps

manually.

There are two types of trap: a spread, in which a lighter object overlaps a darker background and seems to expand

into the background; and a choke, in which a lighter background overlaps a darker object that falls within the

background and seems to squeeze or reduce the object.

Spread (object overlaps background) compared to choke (background overlaps object)

When overlapping painted objects share a common color, trapping may be unnecessary if the color that is common

to both objects creates an automatic trap. For example, if two overlapping objects contain cyan as part of their CMYK

values, any gap between them is covered by the cyan content of the object underneath.

Trapping type can present special problems. Avoid applying mixed process colors or tints of process colors to type at

small point sizes, because any misregistration can make the text difficult to read. Likewise, trapping type at small

point sizes can result in hard-to-read type. As with tint reduction, check with your print shop before trapping such

type. For example, if you are printing black type on a colored background, simply overprinting the type onto the

background may be enough.

Create a trap

The Trap command creates traps for simple objects by identifying the lighter-colored artwork—whether it’s the

object or the background—and overprinting (trapping) it into the darker artwork. You can apply the Trap command

from the Pathfinder panel or as an effect. The advantage of using the Trap effect is that you can alter the trap settings

at any time.

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Adobe Illustrator CS3 User Manual Page 432