Change vector colors to the color of the raster image beneath

1. Use Vector Edit Menu > Modify > Un-Make Polylines to break any polylines. 2. Select Vector Edit Menu > Modify > Vector Colors to Raster Colors. 3. If you want polylines in the DXF file, use Vector Edit Menu > Modify > Make Polylines to recreate them.   You cannot undo Vector Colors to Raster Colors.   See Vectorize a color image to color vectors.