Trap a line – Adobe Illustrator CS4 User Manual
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USING ADOBE ILLUSTRATOR CS4
Printing
Object stroked with fill color
A. Overprinted stroke creates spread trap B. Fill creates knockout C. Area of trap D. Area of knockout
•
Create a choke by entering the same color values
for the Stroke as appear in the lighter background (again, using
the Color panel); the Stroke and Fill values will differ. This method reduces the darker object by stroking its
boundaries with the lighter background color.
3
Choose Window
> Stroke.
Object stroked with background color
A. Overprinted stroke creates choke trap B. Fill creates knockout C. Area of trap D. Area of knockout
4
In the Weight text box, enter a stroke width of between 0.01 and 1000 points. Check with your print shop to
determine what value to use.
For example, a stroke weight of 0.6 point creates a trap of 0.3 point. A stroke weight of 2.0 points creates a trap of 1.0
point.
5
Choose Window
> Attributes.
6
Select Overprint Stroke.
Trap a line
1
Select the line to be trapped.
2
In the Stroke box in the Tools panel or the Color panel, assign the stroke a color of white.
3
In the Stroke panel, select the desired line weight.
4
Copy the line, and choose Edit >Paste In Front. The copy is used to create a trap.
5
In the Stroke box in the Tools panel or the Color panel, stroke the copy with the desired color.
6
In the Stroke panel, choose a line weight that is wider than the bottom line.
7
Choose Window
> Attributes.
8
Select Overprint Stroke for the top line.
A
B
C D
A
B
C D