[GRASS-user] Re: [beginner][r.to.vect] -v? polygonizing only white parts of an image

[baobazz]

thanks for the answer

I launched 

r.reclass input=rasterThin output=rasterReclass
> 1=NULL
> *=1 black

so as to fill null values 

I don't understand why my resulting map was a NULL=>blank raster.. 
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