Hi I think I found a bug in gdaldem color-relief (tested on gdal 2.4.4 and 3.1.0). I'm trying to make a color-relief with the attached dtm file (see attached a micro sample d.tif). The dtm has no "nodata" value set. The following commands produce a very different output, although the difference between the input palettes is just an added nv line which shouldn't make a difference as the input has no ndv value. It seems that gdal is treating the "nv" value as 0 and colors the value 0 as black accordingly.
gdaldem color-relief d.tif c.txt c.tif -CO COMPRESS=DEFLATE gdaldem color-relief d.tif c_nv.txt c_nv.tif -CO COMPRESS=DEFLATE c_nv.txt: 200 red -200 green nv black Should I open a bug report or am I missing something here? Kind regards, Idan
200 red -200 green
200 red -200 green nv black
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