If a person is looking to batch convert a large number of raster images into vector graphics, are there any tools out there that do that well?
For an example, think of just about any diagram that has standard shapes (ellipses, rectangles) and text.
Inkscape uses the Potrace engine to trace raster graphics. You usually have to play with it a bit to get useful output, but it does surprisingly well and is easy to use.
Maybe the desktop edition (not free) of Vector Magic could help you out.
Link: http://vectormagic.com/
I'll enthusiastically second the nomination of Vector Magic.
I recently did some raster to vector conversion work with Adobe Live Trace (Photoshop CS2). It required quite a bit of tuning to get frmo horrible to acceptable.
I tried exactly the same conversion with Vector Magic (used the online version, the first two are free), the configuration questions were easy, the pallete editing was simple and intuitive, and the results were excellent, extremely clean, on the first try. Clearly they have sorted out the issues in de-noising and de-anti-aliasing to produce clean vectors. (In contrast to Adobe which takes noise tones and alias tones and decides to make lots of tweaky little vectors out of them.)
Another alternative is Corel PowerTRACE, though I have no experience with it.
Imagetracer is a free and open source (Public Domain) library and application which might be useful to batch convert files. Disclaimer: I made these.
Get ImageTracer.jar from
https://github.com/jankovicsandras/imagetracerjava
and then the basic usage is:
java -jar ImageTracer.jar smiley.png
This can be automated with standard CLI batch processing, for example with bash:
for file in *.png; do java -jar ImageTracer.jar "$file" outfilename "${file/%ext/svg}"; done
This should create SVGs from all PNGs in the current folder.
来源：https://stackoverflow.com/questions/188680/recommendations-for-converting-raster-images-to-vector-graphics