Gerber OMEGA CP Reference Manual page 269

With either overlap or overprint turned on, both the dark shape and the light shape print
entirely. In this example, the light prints first then the dark prints over the light. Overlap and
overprint can also be used to create interesting designs, especially if the lines per inch or fill of
the two colors are different.
Composer displays the true results of Overlap and Overprint. When a light color overprints or
overlaps a dark color, the base color will show through the top color. Composer displays the
color shift in Filled Mode. For best results, assign the overprint or overlap to the dark color. The
dark color prints over a light color better than light over dark.
There is a danger to using overlap or overprint. Unless the last color (top color) printed is very
dark, like the black in the example, 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 overlap/overprint area is large, the Spectratone color area
may be so noticeable as to be undesirable. It may be better to have the two shapes butt, as
shown in "Removing overlaps and overprints," especially if the two colors are light and a slight
misregistration probably would not be noticeable.
Tip: When Overlap or Overprint is not an appropriate choice due to the color shift, use
Choke/Spread. This eliminates the gap between colors while minimizing visible color shifts.
Note: Overlap and overprint are off when shapes are created. When you turn them on, you
disable the system's ability to automatically sort the foil colors to ensure that the design prints
the way it appears in the preview filled mode. Although this can be used to your advantage, it
requires that you manually sort the foils in the Arrange > Print Order dialog box as described
in "Changing the vinyl and printing order."
Overlap and overprint can be used with both fills and strokes. The overprinted colors are
indicated by an next to the color in the GSPPlot Print Options dialog box foil color list.
O
To apply overlap or overprint to a fill
1 Fill both objects, then select the top (darker) object.
2 Open the Fill toolbar in the Toolbox toolbar.
3 Click the Overlap button
or
Click the Overprint button.
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