Use this tool to re-scale the background image based on a reference measurement.

To Scale the Background Image:

1. On the General toolbar, click Scale Background Image. The Scale Background Image dialog box displays.
2. In the drawing, draw a straight line to connect two points with a known distance between them.
3. In the Actual Distance box, type the known distance between the two points connected in the drawing.
4. Click OK to have the drawing scaled accordingly.