Once a raster has been thinned down to lines of single width pixels, the vectorise button can be used to extract real vectors. This also occurs as the last stage of the 1 Touch Vectorisation option.
During vectorisation a progress meter window shows how quickly the vectorisation is performing, and the number of pixels processed.
When complete, the vectors will be displayed over the top of the raster image. The vectors will be drawn in green (and blue for arcs) unless you have set the Show Line Colour option under the View menu, in which case the vectors will be shown in their actual colours.
Note: when the Show Line Colour option is used the vectors will be the same colour as the raster image, so will not show up well (if at all) against the raster. Therefore the View->Show Raster Image option is usually turned off, so that the raster is not displayed.
The quality or accuracy and number of vectors extracted can be varied by selecting options on the Vector Extraction Options window
Here are some differences between the results produced by the Freeware and Professional versions: