How to convert PNG image to Vertor Image to make font on Mac

Hi Mac People,

I like to create a set of font, and I have made them in a image editing tool, I have FontForge downloaded but decide to use it to convert instead direct design them inside.

So now I don't know how to convert the PNG image to vector image required by the FontForge, I read some post mentioned Ubuntu has utilities to convert, but I'm not sure OS X has that function too.

Could anyone let me know how to convert PNG so I can create my fonts?

If PNG can't, the software can export TIFF or jpeg or similar.

Please help me, I need make them this few day.

Thanks everyone for giving me a hand! 😀