Pruning

Pruning[image] removes the outermost branches of thin objects in image by setting their values to black.

Pruning[image,n] removes branches that are at most n pixels long.

Pruning[image,{n}] removes n pixels from each branch.

Pruning[image,n,t] treats values above t as foreground.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.