I have a simple line drawing that is in shades of light grey against a
white ground. My aim is to increase the grey scale range from 000 199
to 000 to 255. 

Grokking the Gimp suggests I should use the Threshold Tool, but this
produces unsatisfactory results. By moving the sliders I can darken
the light grey to black, but what I'm left with is just what had been
the original very darkest greys, and the lighter greys disappear. 

Am I just being clumbsy, or is there a better approach?   

       Haines Brown
         ET1(SS) U.S.S. Irex 482       
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