Gerber OMEGA CP Reference Manual page 271

♦ Turn Behind Fill off and turn on Overlap: The stroke prints on both sides of the
cutline and over the fill. This is an effective technique for providing good print-to-
print registration; however, if you cut the shape on a plotter, half the stroke (the area
beyond the cutline) will be weeded away.
♦ Turn Behind Fill on and turn on Overlap: The fill prints over the inside half to the
stroke. This is most useful using a clear fill or a fill of the same color. Again, this
provides good print-to-print registration for the stroke; however, if you cut the shape
on a plotter, you will weed away the entire stroke because it is beyond the cutline.
There are two things to keep in mind when assigning a stroke:
♦ Turn on Overlap. If you do not, the fill and the stroke will be butted and could cause a
registration problem.
♦ Keep the stroke as narrow as possible while still fulfilling the objectives of the
design. Unless the stroke is very dark (black, for instance), the combination of printing
one color over another can inadvertently create a Spectratone color (see "Making and
Using Spectratone Chart Colors"). Depending on the colors and if the stroke is very
wide, the Spectratone color area may be so noticeable as to be undesirable. It may be
better to have the two shapes butt, by turning off Overlap, especially if the two colors
are light and a slight misregistration probably would not be noticeable.
Tip: For complete details on how to assign a stroke to an object, refer to "Strokes − Adding
Thickness to the Outline of Objects."
Using a trapline to create an outline
When you add an outline of a different fill to a shape using Tools > Outline, there may be a
small registration gap between the shape and the outline. Using a trapline can eliminate this
print-to-print registration problem as well as eliminating a print-to-cut registration problem on
outlined shapes.
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