>>38978608>>38978732>>38978491>Open the picture in GIMP>select the character>copy it to a new layer alone>resynthesize the character out of the background>select the part of the character you want to have the effect>feather the selection by 256/512/whatever pixels depending on what you want>filters > noise > spreadthere you go
I also wrote my own pixel scattering program that's used instead of the gimp spread filter that sometimes looks better, sometimes looks worse.