Figure 16.86.  Applying example for the Neon filter
This filter detects edges in the active layer or selection and gives them a bright neon effect.
You will finf in GIMP a script-fu also named Neon, which works in a different manner.
You can find this filter through Filters → Edge Detect → Neon....
Figure 16.87.  Neon filter options
This option lets you determine how wide the detected edge will be.
This option lets you determine how strong the filter effect will be.