I download a elevation data (SRTM,GTOPO30) from http://glcfapp.glcf.umd.edu:8080/esdi/index.jsp use gdal_translate -b 1 -of PNG -ot Byte source.tif des.png and gdal_translate -b 1 -of PNG -ot UInt16 source.tif des.png differently, with parameter 'UInt16',I get a black picture,with Byte,get a different one,why? BTW,I want to get a png file from elevation data(.tif),must I use command gdal_translate? Thk u in advance.
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