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Adobe InDesign CC - 2013 Manual

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Join Style
End Style
Step
Trap widths
Trap width is the amount of overlap for each trap. Differences in paper characteristics, screen rulings, and printing press conditions require
different trap widths. To determine the appropriate trap widths for each job, consult your commercial printer.
Specifies the trap width in points for trapping all colors except those involving solid black. The default value is 0p0.25.
Indicates the distance that inks spread into solid black, or the holdback amount—the distance between black edges and underlying inks 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.
In InDesign, the value you set for Black Color determines the value for a solid black or a rich black, a process black (K) ink mixed with color inks
for increased opacity and richer color.
(InDesign) If you choose Application Built-In trapping, and you specify a Default trap width or Black trap width larger than 4 points, the
resulting trap width is limited to 4 points. However, the value you specified will continue to be displayed, because if you switch to Adobe In-RIP
Trapping, traps larger than 4 points are applied as you specified.
Trap appearance
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.
Controls the shape of the outside join of two trap segments. Choose from Miter, Round, and Bevel. The default is Miter, which
matches earlier trapping results to retain compatibility with previous versions of the Adobe Trapping Engine.
Trap join examples, left to right: miter join, round join, bevel join
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.
Close-up of trap end examples: miter (left) and overlap (right)
Trap thresholds
Specifies the color change threshold at which the trapping engine creates a trap. Some jobs need only the most extreme color changes
trapped, while others require traps for more subtle color changes. The Step value indicates the degree to which components (such as CMYK
values) of abutting colors must vary before trapping occurs.
To change how much the component inks in abutting colors can vary before causing those colors to trap, increase or decrease the value for Step
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