It is recommended by the Gerber standard to keep all files positive and
try to limit the need for negative layers. The command "Convert
Negative Plane" will take a negative gerber layer and make it positive.
This command requires 1 or more layer types is defined as "Neg.
Plane". If you wish to use the "PCB Border" as a boundary, please make
sure that is defined.
Here's a tutorial movie showing me convert two negative plane layers into positive plane layers. I am just using the FAB 3000 sample Gerber files found in he folder .../FAB3000v7/examples/274X.
In order for this function to work, how do you define a negative layer type? I watched the video but could not figure it out.
I right clicked to assign a negative layer but still could not convert negative plane.