Image Tracer Script
The script takes an image and creates a spline representing the contour of the black pixel areas.
The image must be black and white, if its not it will get convert it to black and white.
You have control on the image resolution and the threshold value.
Once the image is traced you can smooth and optimize the resulting spline
v 1.01 , March 04 2010: now you can optimize and smooth shapes with more then one spline in it.