You can size the image before drawing also and below are three sizes I made of the same bitmap file. After it's drawn you highlight the whole thing and then change the width of the line segments to fill in the image. I like the 1/2 size the best.
It will even draw components and traces based on a .dxf file. I haven't had any luck getting that to work yet but he has a clear example and Youtube video showing the features. The download is on a CNET site that wants install a bunch of crap on your PC so I've included a clean link here to the latest copy I downloaded.