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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi,<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Speed difference comes probably from the GDAL driver. I have no idea about what it means to add JP2ECW driver to GDAL and QGIS. I can see that
there is a dll file “gdal_ECW_JP2ECW.dll” in a directory “C:\Program Files\QGIS Dufour\bin\gdalplugins” but I do not know if the plugin and GDAL must be compiled together or if even QGIS must be compiled in the same pipe.<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"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-Jukka-<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Jonathan Moules wrote:<o:p></o:p></span></p>
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<p class="MsoNormal">Hi Jukka,<o:p></o:p></p>
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<p class="MsoNormal"> I'm only seeing the JP2OpenJPEG in there (this is for the weeklies, I've uninstalled my 2.0 so can't check that).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">So I guess given the behaviour/speed difference that 2.0 comes with the JP2ECW driver? Would it be much effort to add to the weeklies? Or is there a way to for me to easily add it post-install?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">Jonathan<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal">On 17 December 2013 19:47, Jukka Rahkonen <<a href="mailto:jukka.rahkonen@mmmtike.fi" target="_blank">jukka.rahkonen@mmmtike.fi</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Jonathan Moules <<a href="mailto:jonathanmoules@...">jonathanmoules@...</a>> writes:<br>
<br>
><br>
><br>
> Anyone?<br>
><br>
> On 11 December 2013 17:04, Jonathan Moules<br>
<<a href="mailto:jonathanmoules@warwickshire.gov.uk">jonathanmoules@warwickshire.gov.uk</a>> wrote:<br>
> Hi List,<br>
> A question about the weekly builds (<a href="http://www.qgis.org/downloads/weekly" target="_blank">www.qgis.org/downloads/weekly</a>). They<br>
seem to struggle with loading JP2 files using the usual raster dialog. First<br>
they're incredibly slow, but on top of that when they do load they tend to<br>
be some sort of horrible mess of lots of black of random colours in a<br>
griddish pattern or similar.<br>
><br>
> Do the weekly builds not include a functional JP2 reader? The same rasters<br>
work just fine in the stable release 2.0.1.<o:p></o:p></p>
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<p class="MsoNormal">Hi,<br>
<br>
Check what drivers are baked into GDAL. In Windows you can go to QGIS Dufour<br>
directory, set the environment by running osgeo4w.bat and then you can list<br>
the JP2 drivers as<br>
<br>
C:\Program Files\QGIS Dufour>gdal_translate --formats |find "JP2"<br>
JP2ECW (rov): ERDAS JPEG2000 (SDK 5.0)<br>
JP2OpenJPEG (rwv): JPEG-2000 driver based on OpenJPEG library<br>
<br>
JP2ECW is fast and JP2OpenJPEG is sometimes almost usable. JP2KAK is very<br>
good but that you can't get without Kakadu license. JP2MrSID used to be fast<br>
also but I do not know what is the status with the license.<br>
<br>
If there are several drivers for JPEG2000 GDAL is using the first on the<br>
list. You can skip a driver by setting GDAL_SKIP environment. Thus, if I<br>
would like to have a try with JP2OpenJPEG I should run SET GDAL_SKIP=JP2ECW<br>
first. No idea really how and where I should do it so that QGIS starts with<br>
that setting.<br>
<br>
-Jukka Rahkonen-<br>
<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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