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USING ILLUSTRATOR
Printing
Last updated 11/8/2011
What the Trap command does
A. Area of overprinting B. Area of knockout C. Background color D. Foreground color
In some cases, the top and bottom objects may have similar color densities so that one color is not obviously darker
than the other. In this case, the Trap command determines the trap based on slight differences in color; if the trap
specified by the Trap dialog box is not satisfactory, you can use the Reverse Trap option to switch the way in which the
Trap command traps the two objects.
1
If the document is in RGB mode, choose File > Document Color Mode > CMYK Color to convert it to CMYK Mode.
2 Select two or more objects.
3 Do one of the following:
To apply the command directly to the objects, choose Window > Pathfinder, and choose Trap from the panel
menu.
To apply the command as an effect, choose Effect > Pathfinder >Trap. Select Preview if you want to preview the
effect.
4 Set trap options, and click OK.
More Help topics
About effects” on page 370
Apply Pathfinder effects” on page 244
Pathfinder panel overview” on page 243
Trap options
Thickness Specifies a stroke width between 0.01 and 5000 points. Check with your print shop to determine what value
to use.
Height/Width Specifies the trap on horizontal lines as a percentage of the trap on vertical lines. Specifying different
horizontal and vertical trap values lets you compensate for on-press irregularities, such as paper stretch. Contact your
print shop for help in determining this value. The default value of 100% results in the same trap width on horizontal
lines and on vertical lines. To increase the trap thickness on horizontal lines without changing the vertical trap, set the
Height/Width value to greater than 100%. To
decrease the trap thickness on horizontal lines without changing the
vertical trap, set the Height/Width value to less than 100%.
A
B
C D
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