Reverse trapping will generate white lines to avoid colors touching or overlapping in case of misregistration. This is useful to prepare a job for Dry Offset printing (e.g.: metal beverage cans) where overprinting of inks is not allowed as the inks would contaminate each other on the blanket.
The ArtPro+ Trapper offers an Automatic Trapping mode for Reverse Trapping, which generates a dynamic reverse trap layer.