Trap Setting tab

Select this option to implement the sliding gradient trap (a trap that occurs between two gradients). The generated trapping area will have a gradient effect and the direction of the trap will be on both sides in order to make the trap area less noticeable. If this option is not selected, the generated trapping area will  have the gradient effect, but the trapping direction will be consistent and in only one direction.

If you allow sliding, use the box beside it to specify a percentage by which to control sliding traps to create a smooth transition. A setting of 100% will force a sharp change of trapping direction, while 0% will force a constant centerline trap.

The trap direction will use the color sequence in the ink manager for direction of traps, in addition to other trapping setting. The options are:

• In Order: The smaller color sequence number color spreads into the bigger color sequence number color.
• Reverse Order: The larger color sequence number spreads into the smaller color sequence number color.  

In this example, three colors (C, M, and Y) are arranged according to two different color sequences options, with two different results after color sequence trap is executed.

First color sequence          
Second color sequence  

When generating trap between ‘A’ color and ‘B’ color and trap direction is from ‘A’ color to ‘B’ color, trap width is larger than the width of ‘B’ color, and ‘C’ color which is located on the other side of ‘B’ color also meets trap condition with ‘A’ color, their trap direction also is from ‘A’ color to ‘C’ color, the final trap effect is that ‘A’ color crossed ‘B’ color into ‘C’ color. 
 

Select this option to automatically optimize the trapping direction. 

Optimized shapes is not selected:
 

Optimized shapes is selected:

Due to the way that certain files are constructed, traps can overflow beyond the desired area if the No overflow setting is cleared.

To prevent the trap from moving out of the desired trap areas, select the No Overflow setting.

 There are four Trap fill modes:

• Overprint fill: This is the basic trap fill mode. The property of the trap area is overprint.
• Darken: The property of trap area is darken.  Note: Darkened objects maybe cannot be processed correctly.
• Darken Image Trap: If you select the Darken mode, the property of the image trap area is Darken.  Note: After using Darken property, the path of Image trap area will be decreased
• White knockout: The trap area will be filled with normal white color (CMYK is 0). The image shows the before and after of white knockout
  

If the image transparency is less than the minimum value, trapping will not be generated. Trapping will be generated along the image edge when the transparency value is greater than or equal to the minimum value specified.

Set the color type of image trap. Options include:

Original Image Color: The result is the image data outside of the clipping mask:

Image Expand Color: The result is the automatically generated data along the image edge. If there is a trim mask outside of the image, the data still will be generated and will not use the original data outside of the trim mask.
   

The parameter setting range is from 0 mm to 0.5 mm. If the distance (gap) between the two objects is smaller than this set parameter value, then the gap will be filled, and determine the conditions of normal trap or pullback trap to the two padded objects; If the gap width is bigger that the defined value, then it will not fill.

Example 1: Between the C and M color objects there is a Y color object with a width that is smaller than 0.1 pt created through a design error. Set "Maximum Gap = 0.1 pt", then this gap can be filled, and generate accurate trapping. 

Original object: A Yellow color flash (gap) is between the Magenta and Cyan color

The effect after the implementation of normal trapping and without setting Maximum Gap.

The effect after the implementation of normal trapping and padding with setting Maximum Gap = 0.1 pt.

Example 2: There is a fine line (gap) with a width smaller than 0.1pt created through a design error. By setting "Maximum Gap = 0.1 pt", area can be padded, and generate accurate trapping.  
 

Original object: A fine line (gap) is between the two Y color areas.
 

The effect after the implementation of normal trapping and without setting Maximum Gap.

The effect after the implementation of normal trapping and padding with the setting Maximum Gap = 0.1 pt.  

This parameter is used to set the termination position of the trapping area, to prevent the trapping area over the border of a trapped object and creating a significant change to the trap area. There are two options:

• On Edge The trapping area ends at the outside edges of the object being trapping into.
• On Center. The trapping area ends at the center between the trapping object and object being trapped into.

 The original file before trapping

 The trapping effect of On Edge
 The trapping effect of On Center

This parameter is used to set the contour shape of the trapping area entering into another object. Options include:

• Square: Generate a right-angle endpoint
• Round: Generate a round-angle endpoint
• Object dependant: Based on the light-colored object to extend 
  The original file before trapping 
  The trapping effect of Square
  The trapping effect of Round
  The trapping effect of Object dependant