Converting classified raster map back into vector classes using QGIS?

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I have this map (have whole country, this is just a sample, original map also contains color symbology for the value classes) and need to attach the values from it to points.



I have no problem to georeference it in QGIS but there is problem with the values.

I see two uncomfortable possibilities:

1. attach the values manually using the map legend.
2. manually vectorize the map in QGIS and add the value classes

But it would be nice, if I could somehow (semi-)automatically vectorize the map using the color (RGB?) values to build the vector classes in shapefile format. Is this possible?

I have here SAGA GIS, QGIS and I have also access to one PC with Arcgis 10 with Spatial and 3D analyst. Is it possible or do I have to use the manual way?

It is almost impossible to obtain source data (will try, but I am pessimistic in this way)



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