This is an old revision of the document!
Use Cubic control points.
Import the image.
Scale the image.
Put the image at the baseline.
Move the guides.
Convert the image to black and white.
Adjust cutoff threshold, the amount of details and the path simplification. The default settings will generate smooth curves with few control points if you set path simplification to a low value (0.100) and the amount of details to a higher value (2.000) will rough edges be preserved.
Generate vector graphics from your image.
Hide the image.