use imagemagik to convert image to svg
#!/usr/bin/env bash
###
# convert an image file to svg, png in this sample
### Prerequisite
# http://www.imagemagick.org/script/index.php
for f in `ls *.png`
do
fname=`echo $f | cut -d '.' -f 1`
target="${fname}.svg"
convert $f $target
done