Vector Graphic Program

Here's the website I mentioned in class today:

http://vectormagic.stanford.edu

The idea is that most image files are composed of pixels, which is why, when you enlarge them, they look grainy. A vector image, by contrast, is defined by graphical data--points and lines rather than pixels--so you can make them as large or small as you need them to be without affecting image quality.

Generally, the simpler the image, the more easily you can make it into a vector image, but experiment and see what works.