This parameter has no effect on positive layers. On
negative layers, it determines whether processing is done on actual features
or on copper (the result of inverting the layer).
Features - the
algorithms operate on the layer as is. That means, for instance, that small
remaining features (rather than copper) islands will be removed in clean
small holes.
Copper - then for each negative layer the system will
automatically create a mirror inverted layer (in memory only) that will be
used for the Action rather than the original layer. The inverted layer has as
a first feature the profile of the step as a positive surface, into which all
the layer features will be negatively merged. Thus all positive elements will
represent copper instead of laminate.
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