R - Commands  
REGION_AI (command)
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It adds an island to a region

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 Command line: REGION_AI

 

The REGION_AI command adds islands by defining their perimeter. The following prompt is displayed: Select a region: select a previously created region. Next prompt:Select the objects defining the perimeter of an island inner to the region [Tolerance] <0.000000>: press  T to set the tolerance, then select one by one the objects defining the perimeter of the image to convert into an island.

 

Also see:

REGION