Adobe CS5 Illustrator Live Trace Feature
The Adobe Creative Suite 5 (Adobe CS5) Illustrator Live Trace function allows you to use existing images in your new artwork. You can automatically trace bitmap images by using a variety of settings that range from black-and-white line art to vector art with multitudes of color that can be extracted from your image.
Choose File→Place and select an image that you want to trace.
The file you place can be a logo, a sketch, or even a photo. Notice that after you place the image, the Control panel offers additional options.
Click the arrow to the right of the Live Trace button.
This drop-down list provides Live Trace presets that may help you better trace your image.
Scroll to the bottom and choose Tracing Options.
The Tracing Options dialog box appears.
Select the Preview check box.
Experiment with the various settings especially if you are converting bitmap images to vector objects.
When you find the setting that works best for your image, click the Trace button.
You can return to the Tracing Options dialog box and change settings repeatedly until you find the best one.