It is pure black.<br><br>I am using hgt data from <a href="ftp://e0srp01u.ecs.nasa.gov/">ftp://e0srp01u.ecs.nasa.gov/</a> so that should be 16bit I believe. One thing I did try is convert the data to a 16 bit geotiff file and then convert that to a 16 bit png but I get the same results.<br>
<br>Thanks,<br>Jon Jones<br><br><div class="gmail_quote">On Tue, Jan 27, 2009 at 2:01 PM, Matt Wilkie <span dir="ltr"><<a href="mailto:matt.wilkie@gov.yk.ca">matt.wilkie@gov.yk.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><div></div><div class="Wj3C7c">> If I use "gdal_translate -ot Int16 -of PNG infile.hgt outfile.png" I get<br>
> an 8 bit grayscale image. If I use "gdal_translate -ot UInt16 -of PNG<br>
> infile.hgt outfile.png " I get a 16 bit grayscale image but now it is<br>
> pure black. Any ideas?<br>
<br></div></div>
With the latter case is it pure black or just really dark? Bring the image into a photo program (gimp, photoshop) and use Auto-levels (don't save though or it will alter the values).<br>
<br>
For the former, I don't have any problem creating int16 .png from a geotiff elevation file. Perhaps that's because the source is int16 though.<br>
<br>
cheers,<br>
<br>
<br>
matt wilkie<br>
--------------------------------------------<br>
Geographic Information,<br>
Information Management and Technology,<br>
Yukon Department of Environment<br>
10 Burns Road * Whitehorse, Yukon * Y1A 4Y9<br>
867-667-8133 Tel * 867-393-7003 Fax<br>
<a href="http://environmentyukon.gov.yk.ca/geomatics/" target="_blank">http://environmentyukon.gov.yk.ca/geomatics/</a><br>
--------------------------------------------<br>
<br>
<br>
Jon Jones wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
-- <br>
Jon Jones<br>
<br>
<br>
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