(Outsourced artistic talent is very, very cheap. Find somebody you like on one of the sites, develop a working relationship, bring them work on a regular basis. Its a win for you and a win for them: you don't waste your super-valuable time doing low-value-added tasks, they don't have J. Clueless Client asking for 15 revisions and then dickering around with actually paying them for services rendered.)
Some months ago, I used potrace to convert drawings to SVG. Specifically, on a Windows box, if I recall correctly, I used it via the front end Rasterbater (needs .NET 2). I was quite satisfied with the result.
This was for some simple black on white images. The Wikipedia page for potrace (first link, below) has a bit of language about Inkscape being able to do a color decomposition.
> Inkscape is capable of producing color images by
> decomposing each channel into several black and white
> images and tracing them separately with Potrace.
http://en.wikipedia.org/wiki/Potracehttp://potrace.sourceforge.net/
Link to Rasterbater is under the anchor below (it's a link to a zip of the program; the program doesn't appear to have it's own descriptive page, although the hosting site has a one line description on the default page for the domain):
http://potrace.sourceforge.net/#other
Regarding Inkscape, this boingboing page (I happened on while googling Rasterbater) has the following comment:
http://www.boingboing.net/2007/11/21/web-site-converts-ph.ht...
> Inkscape ( http://www.inkscape.org/ ) uses Potrace
> (http://potrace.sourceforge.net/ ) and optionally
> Autotrace ( http://autotrace.sourceforge.net/ ) for
> it's own raster to vector. It costs 100% less than
> the price of Illustrator CS or Corel, a.k.a free.1. used my camera to take photo of an illustrated page from a very old book (copyright expired). i borrowed the book via LINK+, and it was delivered to my local library for free.
2. used Vector Magic to vectorize (within 2 free "credits" limit) the image.
3. edited result of #2 with Inkscape, so it's much more "stylized" (much simplified; just a few filled-and-stroked paths).
There are far too many options...