Vector Magic is an online tool that converts bitmaps into vector images. It provides a wizard that helps you through the process, so you can easily generate your vector graphics from bitmaps, then import into Microsoft Expression Designer or Blend. I already used it several times and the results are amazing! It is also impressive to have such a service as a website!
First step is to upload your picture (gif or jpg):
At first the tool try to identify your image (logo or photo):
The correct type is automatically selected for you:
Then you match the quality level of your picture:
This step is for logos:
You get a list of colors palettes related to your logo, with the best match selected for you:
Finally the tool vectorizes your image and show a preview of the result with a comparison to the original:
Now you can download your image as a vector file!Note: this service is not free anymore, but you can try it (upload, vectorize, preview, get unlimited png images and 2 vector results) without any subscription.