Compress & base64 encode your PNG file

png2minb64.sh

fs8=`ruby -e "print '$1'.sub(/\.png$/, '-fs8.png')"`
if test -e "$fs8"; then
	rm $fs8
	echo "rm $fs8\n"
fi

todataURI()
{
	openssl base64 -in $fs8 | awk -v ext="png" '{ str1=str1 $0 }END{ print "data:image/"ext";base64,"str1 }' | pbcopy	
}

pngquant -verbose 256 $1;
optipng -o7 -out $fs8 $fs8 && todataURI $1 && echo "copied $fs8\n";