weixj2003ld,<br><br>I couldn't open the link.<br>Try "gdalinfo -mm des.png" on both the output images. I think they will both give the same output. UInt16 should give a dark image unless you perform histogram equalization on it.<br>
<br><div class="gmail_quote">2010/5/11 weixj2003ld <span dir="ltr"><<a href="mailto:weixj2003ld@163.com">weixj2003ld@163.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>I download a elevation data (SRTM,GTOPO30) from <a href="http://glcfapp.glcf.umd.edu:8080/esdi/index.jsp" target="_blank">http://glcfapp.glcf.umd.edu:8080/esdi/index.jsp</a></div>
<div> </div>
<div> use </div>
<div>gdal_translate -b 1 -of PNG -ot Byte source.tif des.png</div>
<div>and </div>
<div>gdal_translate -b 1 -of PNG -ot UInt16 source.tif des.png</div>
<div>differently,</div>
<div>with parameter 'UInt16',I get a black picture,with Byte,get a different one,why?</div>
<div>BTW,I want to get a png file from elevation data(.tif),must I use command gdal_translate?</div>
<div>Thk u in advance.</div>
<div> </div>
<div> </div><br><br><span title="neteasefooter"></span><hr>
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