Gerber OMEGA CP Reference Manual page 272

258 Chapter 25:
Solving Printing and Registration Problems
Eliminating a print-to-print registration gap
A trapline is composed of a bleed and an overprint. The bleed is the same fill as in the original
shape and is printed away from the border of the original shape. A different fill, called thickness,
is printed over and beyond the bleed, thus eliminating a registration gap while adding an
outline. The appearance is similar to a stroke. (The difference between a trapline and a stroke is
that the amount of printing inside and outside the shape can be different. With a stroke, the
amounts are equal.)
There are important rules which must be followed when using Trapline.
♦ The thickness must have a positive value and cannot equal 0.
♦ The bleed must have a positive value, cannot equal 0, and cannot be greater than the
thickness.
♦ The bleed cut amount cannot be greater than the difference between the thickness and
the bleed.
♦ If both fills are not solid fills, or if the trapline color is not a solid fill, use a small bleed
amount to fill the registration gap (such as .010) and minimize a Spectratone effect.
♦ When Trapline is used, all cutlines are removed unless you add a bleed cut.
To assign a trapline to eliminate a registration gap
1 Select and fill a shape.
2 Turn off cuts.
3 Change the current fill to the attributes that you want the outline to be.
4 Select the shape, then click Tools > Trapline to open the Trapline dialog box.