On Wed, Aug 24, 2011 at 9:55 AM, Salvatore Mellino <salvatore.mellino at gmail.com> wrote: >> >> >> Hi, >> >> I have downloaded a DTM from internet (.tif) but the image is black. How can I fix this problem? You need to apply a color table (change the range of the DTM first with r.info), this is done with r.colors. Markus