[gdal-dev] get different result when use different parameters

weixj2003ld weixj2003ld at 163.com
Mon May 10 23:16:55 EDT 2010

I download a elevation data (SRTM,GTOPO30) from http://glcfapp.glcf.umd.edu:8080/esdi/index.jsp
gdal_translate -b 1 -of PNG -ot Byte source.tif des.png
gdal_translate -b 1 -of PNG -ot UInt16 source.tif des.png
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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