Re: [Inkscape-user] How to vectorize diagrams

...

I've already removed the colored background and increased contrast. I couldn't find settings that would produce a nice result, though. Any recommendations?

Other than the above, not really. Can you tell us more about what sort of images you're tracing, or (if they're small) post a (url to a) sample?

Here is a pdf (ca. 400KByte): http://fipa.umbc.edu/18/odell.pdf with some UML diagrams. I'd like to 'vectorize' the UML on page 8. I extracted that diagram, removed the blueish background, increased contrast and played a bit with the settings. Alas, nothing to be proud of resulted... ;-)

thanks for helping Steffen