<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=FR link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Is this with MG3 or MG4 files? MG4 uses an alpha channel instead of nodata, so what you describe would be expected in that case.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> gdal-dev-bounces@lists.osgeo.org [mailto:gdal-dev-bounces@lists.osgeo.org] <b>On Behalf Of </b>Oyvind Idland<br><b>Sent:</b> vendredi 13 mai 2011 04:28<br><b>To:</b> gdal-dev@lists.osgeo.org<br><b>Subject:</b> [gdal-dev] GDAL 1.8.0 and MrSid "no-data" values<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi,<br><br>I just updated to 1.8.0 from 1.7, using the MrSid DSDK 8.0. <br><br>In order to handle transparency, i have until now used the metadata values from "IMAGE__NO_DATA_VALUE", <br>and simply masked away pixels.<br><br>After upgrading, the IMAGE__NO_DATA_VALUE yields nothing, neither is it listed when using gdalinfo.<br><br>The band->GetNoDataValue() doesn't give me any hints either.<br><br>Should I handle this in a different way ?<br><br><br>-- Oyvind<o:p></o:p></p></div></body></html>