Trace contours?

Wolfgang Hugemann <[email protected]> Mon, 07 Feb 2011 16:50:41 +0100
Newsgroups gmane.comp.video.image-magick.user
Message-ID <[email protected]>
How can the Photoshop 'Trace Contours' filter (see 
http://www.graphics.com/modules.php?name=Sections&op=viewarticle&artid=309 
or, somewhat simpler 
http://www.hirschi.ch/photoshop/workshops/filter/stilisierung/konturwerte/konturwerte.htm) 
be reproduced in ImageMagick? Any Ideas?

Wolfgang Hugemann