Adobe illustrator 10 Manuale Utente

method reduces the darker object by stroking its boundaries with the lighter 
background color.

3 Choose Window > Show Stroke.

Object stroked with 1-point stroke of background color 
A. Stroke creates choke trap B. Fill creates knockout C. Area of trap D. Area of knockout

4 In the Stroke palette, in the Weight text box enter a stroke width of between 0.6 and 
2.0 points. 

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. Check with your print shop to determine what value to use.

5 Choose Window > Show Attributes. 

6 Select Overprint Stroke. 

In a spread, the lighter object traps into (overprints) the darker background. In a choke, 
overprinting the stroke causes the lighter background to trap into the darker object.

1 Select the line to be trapped. 

2 In the Stroke box in the toolbox or the Color palette, assign the stroke a color of white.

3 In the Stroke palette, 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 toolbox or the Color palette, stroke the copy with the desired 
color. 

6 In the Stroke palette, choose a line weight that is wider than the bottom line.

7 Choose Window > Show Attributes.

A

B

C

D