Ignore Area: Vectorize: Trace

The Ignore Area is the threshold used to determine the minimum size of Paths.

If the interior area of a Path, in pixels, is less than this value, it is ignored. 

Essentially, the larger the number, the more details it will ignore. 

Load an image. 

This is an exaggerated image that has a lot of smudges and artifacts from being scanned and faxed.