Gerber OMEGA CP Reference Manual page 233

Edge Family Tab
Use the Substitute Halftones for Edge Family check box to choose an alternative to a halftone in
the job. You might want to do this:
♦ If resizing an Edge job from the original size.
♦ When converting an Edge job from Spot to Process foils.
♦ When importing an image or vector file directly into the GSPPlot program.
When using Classical Dot or Spiral Dot as the substituted halftone type for GERBER EDGE
output, you can enter in an LPI value between 4 and 300 LPI (although the practical range of
LPI settings is usually in the lower range). The LPI cannot be set for any of the other halftone
types.
219