Use DXF as intermediary to import SVG into Archicad.
You can save an SVG file as a DXF using Inkscape, a very powerful free SVG creator/editor. Available at
One caveat: The DXF script out of the box does not create a suitable DXF. But you can download the "Better Better DXF Output" script from this link:
I was able to trace an existing profile photo of a crown molding by doing the following:
1. Import raster image into Inkscape.
2. Use the bitmap trace feature to have the program automatically turn the profile in to SVG format.
3. Save as DXF
4. Open in ArchiCAD as DXF for use as a polygon to profile.
It takes a few steps but it beats trying to trace the complex profile by hand.