Spread: A lighter object overlaps a darker background and seems to expand into the background.
Learn how to trap color between objects and trapping options in Illustrator.
Where colors printed from separate plates overlap or adjoin one another, incorrect registration by the printer can cause gaps between colors on the final output. You can use a Trap (a small area of overlap between colors) to compensate for potential gaps between colors in your artwork.
There are two types of traps:
The Trap option creates traps for simple objects. It identifies the lighter-colored artwork (object or background) and overprints (trapping) it into the darker artwork. Apply the Trap option from the Pathfinder panel or as an effect, and alter the settings at any time.
Ensure your artwork is in CMYK color.
If your artwork is in RGB mode, go to File > Document Color Mode > CMYK Color.
Follow any of these options:
To apply the command directly to the objects, go to Window > Pathfinder. Select Trap from the panel menu.
To apply the command as an effect, go to Effect > Pathfinder >Trap. Select Preview if you want to preview the effect.
Set trap options, and select OK.
A. Area of overprinting B. Area of knockout C. Background color D. Foreground color
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%. |
Tint Reduction |
Reduces the tint of the lighter color being trapped; the darker color remains at 100%. This option is useful when trapping two light-colored objects, where the trap line may show through the darker of the two colors, resulting in an unsightly dark border. For example, if you trap a light yellow object into a light blue object, a bright green border is visible where the trap is created. Check with your print shop to find out what percentage of tint is most appropriate given the type of press, inks, paper stock, and so on being used. |
Traps With Process Color |
Converts spot-color traps to equivalent process colors. This option creates an object of the lighter of the spot colors and overprints it. |
Reverse Traps |
Traps darker colors into lighter colors. This option does not work with rich black—that is, black that contains additional CMY inks. |
Precision (as effect only) |
Affects how precisely an object's path is calculated. The more precise the calculation, the more accurate the drawing and the more time is required to generate the resulting path. |
Remove Redundant Points (as effect only) |
Removes unnecessary points. |
For more precise control of trapping and for trapping complex objects, you can create the effect of a trap by stroking an object and setting the stroke to overprint.
In the Stroke box in the Tools panel or the Color panel, follow any of these options:
To create a spread, enter the same color values for the Stroke as in the Fill.
To create a choke, enter the same color values for the Stroke as in the lighter background. Here, the Stroke and Fill values will differ.
Go to Window > Stroke.
Enter a stroke width between 0.01 and 1000 points for the Weight option.
Your trap value is half of the stroke width value. Check with your print shop to determine the stroke width.
Go to Window > Attributes.
Check Overprint Stroke or Overprint Fill.
A. Overprinted stroke creates choke trap B. Fill creates knockout C. Area of trap D. Area of knockout
A. Overprinted top stroke creates spread trap B. Bottom stroke creates knockout C. Area of knockout D. Area of trap
Draw a line along the edge or edges that you want to trap. If the object is complex, use the Direct Selection tool to select the edges to be trapped, copy them, and choose Edit > Paste In Front to paste the copy directly on top of the original.
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