[GRASS-user] Re: Extracting grey features from an image

[baobazz]

Thanks a lot for the answers!

I managed to identify the range of values containing the grey category
values.
So, my command became:
r.mapcalc grey_raster=if(tragh.red>=132&&tragh.red<=200, 1, null())

It was a little difficult.
I had to make it step by step.

One way would be to use in addition 
r.what
or
r.what.vect
to sample the cat values corresponding to my grey zones

Thank you
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