For converting bitmap image to vector image you need to have autotrace library installed .
If you not installed you can install that bu using the command “yum install autotrace”.
Follow the instruction step till the installation is complete.
Once its installed you can use the below command to convert the image to vector format.
$ autotrace testInputImage.png -output-file testOutputImage.svg
Other example :
$autotrace –input-format=jpg –output-file=tshirt.ai –dpi=1024 –color-count=256 –despeckle-level=0 –despeckle-tightness=0 –corner-always-threshold=60 –line-threshold=0.1 –width-weight-factor=0.1 –line-reversion-threshold=0.1 –preserve-width –remove-adjacent-corners tshirt.ai 2>&1
and your are done.
For more information and option visit http://autotrace.sourceforge.net