[GRASS-user] Create outer line of raster

[Paul Meems]

Hi List,

I have an ECW-file which I convert to GeoTiff using gdal_translate.
This GTiff file I use in GeoServer as a base map.

This is working great, but because I compress the GTiff with JPEG I get
white borders around my area. To solve this I can clip my GTiff with the
outer line of my original ECW file.

My question is how to create such an outer line. I can of course draw it
myself using QGis or MapWindow but I'd prefer to let it calculated.
Can GRASS do this? If so which command do I need.

Thanks,

Paul
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