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How can I edit a photo so it ends up looking likje a sketch? Example:
You don't mention any particular software, but if you want to do this manually it is a similar process in Photoshop, Illustrator, Gimp or Inkscape:
Open it as a background in Artrage and trace away.
You can try a pile of different filters...find edges, posterization, adjust levels. But typically it's best/easiest to do just what Michael suggests...trace it.
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