[gdal-dev] gdalwarp produces all black output

[David Strip]

gdalinfo -mm shows your input data file has all it's values in the range 
518 to 2396. When converted to a 16bit tif, these all fall in a range 
that appears black on your screen. You need to rescale the data to fill 
the 16bit range. This is easily done with gdal_translate, which is 
probably what you want to use anyway, since you're not changing the 
projection, only the data format.

gdal_translate -ot Int16 -scale 518 2396 0 32767 n29.dt1 mosaic.tif