<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">Hi all!</font></font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3" face="Calibri"> </font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">I have a problem when producing overviews in a jpeg compressed tiff.with Gdal 1.7.2</font></font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3" face="Calibri"> </font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">After my basic image is produced, with the GeoTIFF driver, I call BuildOverviews("GAUSS",overviewlist,nothing,nothing)</font></font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">overviewlist is 2,4,8,16,32,64,128</font></font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">(It's a <a href="http://VB.NET">VB.NET</a> 2010 app.)</font></font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">I get this message: GetBlockRef failed at X block offset 1, Y block offset 0</font></font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">It's the same in my program as in GdalOverviews.</font></font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">The basic image is made line by line with RGB bands.</font></font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3" face="Calibri"> </font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">The image is 7588 by 5492 pixels.</font></font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">I use PHOTOMETRIC=YCBCR,PROFILE=GEOTIFF,COMPRESS=JPEG,TILED=YES</font></font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">If I add BIGTIFF=YES when creating it, the overviews generation seem to work, but the colors are all messed up in the overviews</font></font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3" face="Calibri"> </font></span></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><font size="3" face="Calibri">Hints, anyone?</font></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><font size="3" face="Calibri">-</font></p>
<p style="MARGIN: 0in 0in 0pt" class="MsoNormal"><font size="3" face="Calibri">Helgemor</font></p>