[FWTools] Converting raster dataset to vector.

[Michał Krzywda]

Hi all,

I would like to convert raster file to vector format for instance PNG to GML.
I know it's hard to do it, and result might not be brilliant, but I would like to try.

Among all articles and FAQ's I have found:
http://trac.osgeo.org/gdal/wiki/FAQRaster#Howtoconvertarastertoalayerofpolygons

Is there any resource how to perform such conversion?
Which tools I need use to perform transformation, assuming that I'm starting with ordinary PNG file.

Regards,
Michał