Appendix F: The Trapping editor
The Trapping editor
[35] Fig. Trapping Presets Editor
Trap width
Trap width is the amount of overlap for each trap. Differences in paper characteristics, screen
rulings, and printer conditions require different trap widths.
•
Default width:
Specifies the trap width in points for trapping all colors except those involving solid black.
The default value is 0p0.25.
• Black width:
Indicates the distance that toners spread into solid black, or the holdback amount-the distance
between black edges and underlying toners for trapping rich blacks. The default value is 0p0.5.
This value is often set to be 1.5 to 2 times the value of the default trap width.
Trap Appearance
• Join Style:
A join is where two trap edges meet at a common endpoint. You can control the shape of the
outside join of two trap segments and the intersection of three traps. Join Style Controls the
shape of the outside join of two trap segments. Choose from Miter, Round, and Bevel. (Left to
right)
[36] Fig. Trap Join Styles
• End Style:
Controls the intersection of three‑way traps. Miter (the default) shapes the end of the trap to
keep it away from the intersecting object. Overlap affects the shape of the trap generated by
the lightest neutral density object that intersects with two or more darker objects. The end of
the lightest trap is wrapped around the point where the three objects intersect. In the example
the left image shows the miter effect. The right image shows the overlap.
Appendix F: The Trapping editor
158 Chapter 11 - Appendix
PRISMAsync V3.2
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