[GRASS-user] Remove red lines from raster images

[kaipi]

Dear Users,

I have a couple of raster maps (RGB PNG images) where I need to remove the
red grid lines. What would be the best way to do this with Grass ? I thought
about using r.mapcalc to turn the red pixels (RGB value 255 0 0) to NULL
data and then use r.fillnulls to interpolate the NULL data. I now how to do
this for elevation data, but how to do this with RGB data  ? 

Thanks for any suggestions !

Harry 



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