qgis - Polygonize function doesn't overlay the shapefile over the raster file

To convert the raster into a shapefile I use raster->conversion->polygonize but QGIS doesn't open the new layer overlayed the first (the raster) but reflected above it.

I read this question Polygonize problem but it is incomplete and there are no solutions. I've changed CRS I used EPSG:4326 for both or User Defined but nothing...

I've changed image format, .tiff .jpg, nothing!

This is the original .bmp file:

These are the metadata of the shapefile:

General: Storage type of this layer: ESRI Shapefile Source for this layer: gisprovavector Geometry type of the features in this layer: Polygon The number of features in this layer: 2 Editing capabilities of this layer: Add Features, Delete Features, Change Attribute Values, Add Attributes, Delete Attributes, Create Spatial Index, Fast Access to Features at ID, Change Geometries Extents: In layer spatial reference system units : xMin,yMin 0,0 : xMax,yMax 962,500 Layer Spatial Reference System: +proj=longlat +ellps=WGS72 +towgs84=0,0,1.9,0,0,0.814,-0.38 +no_defs

I use QGIS 1.8.0 in Windows XP!