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I think what the OP is talking about is taking a photograph and turning it into line-art.... which is much harder and there isn't a really good solution for. There are filters like "find edges" but they are more "artistic" than accurate. The best thing to do in that case would be to actually use the pen tool to draw the outlines by hand.

If that's not the case, maybe some more explanation, or even better and example image, would be greatly helpful 7january.

Welcome to the forums, btw.