There is no way to automatically do it well. If you're not too fussy about the results, "Vector Magic" is probably the best autotrace program available.Do you know if you could convert a picture of someone into a drawing on Illustrator?
Here is an example:
That is a portion of a 600 DPI scan of the Coca-Cola logo. This is nearly a "best case scenario" for an autotrace program; i.e., only two colors, high DPI, sharp transisitions between colors, etc.
Here are the results of an autotrace in Vector Magic:
And here is a zoomed in view:
Here is a manual trace using the pen tool in Illustrator:
And a zoomed in view:
Feed an autotrace program some trickier raster images and you'll get far worse results than the ones I posted above. The main problem is that the algorithm doesn't "know" anything. For example, a human can look at the spine of the "a" and know it is supposed to be a straight line, even if a pixel-by-pixel examination shows that it has some jagged edges. Humans have an eye for what "looks right" in general; the algorithm doesn't.
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