There are times when we want to work fast and lean, so we grab screenshots of items off the web and plop them into our wireframes. But there are other times when we want a more polished finish. It is during those times that we’ll need Illustrator’s vectorizing abilities to trace images that we want to scale.
Below are directions for using Illustrator’s Trace feature to trace a bitmap image.
1) paste an image into Illustrator
2) with the image selected, go up to the Object menu, then Trace > Make & Expand
3) Voila! Your image is compromised of vectorized parts.