Illustrator can trace raster images, such as digital photos or scans of drawn or sketched images. It has two kinds of tracing: manual and automatic. Pages 67–74 showed how you can manually trace a reference file using drawing tools, but Illustrator’s Live Trace feature creates the tracing for you automatically.
Automatic tracing is different from the manual version in several ways.
ONE: It’s extremely fast. And after you trace an image, the finished drawing is editable, just like any other artwork in Illustrator.
TWO: It’s extremely accurate, depending on the tracing options you choose.
THREE: It’s extremely flexible. You can create vastly different drawings from the same source file.
FOUR: It’s extremely easy. ...