Thanks for the replied Guys. My use of GDAL is very generic, allowing any end user visuaise any image format that GDAL supports via a web browser using a Java backing with JNI bindings to GDAL binaries. (This particular 6MB ECW file is one of hundreds that I've tested)
The code as-is works for all image formats and for sub-portions of the ECW file. I guess my question should be more directed to the Java bindings directly and if there is anythings that I can do there... As its at this stage (allocating the Java memory in byte[] that my applicaiton is running out of memory) Thanks, Ronan On 18 November 2010 15:54, Greg Coats <gregco...@mac.com> wrote: > From a JPEG2000 image, you can use kdu_expand -reduce to quickly extract an > image of the top (or any other) level pyramid. In the example below, I > extract from a JPEG2000 image, pyramid level 10 from a 142 GB image in 0.10 > seconds. Perhaps you could consider using JPEG2000. > Greg > > $ ls -hl dcua0171_BigTiffYes.tif dcua0171_BigTiffYes_rev.jp2 > 142G Feb 16 2010 dcua0171_BigTiffYes.tif > 58G Feb 16 2010 dcua0171_BigTiffYes_rev.jp2 > $ /usr/bin/time $kdu_expand -i dcua0171_BigTiffYes_rev.jp2 -o reduce10.tif > -reduce 10 > Copying Geo box info, size = 387 > 0.10 real 0.08 user 0.02 sys > $ ls -hl reduce10.tif > 143K Nov 18 10:37 reduce10.tif > > On Nov 18, 2010, at 10:24 AM, Ronan Crowley wrote: > > Hi All, > > I'm using GDAL (via Java) to view an ECW file. > > It generally works fine, however I'm having serious memory issues. > > I have a 6MB ECW file, that when I try to view in its entirety I get > OutOfMemory errors. > > The code I'm using to extract the image is pretty much the code from the > GDALtest.java file in the swig sub-project. > > What I'm wodering, is if there is any way to get the number of pyramid > levels inside the image and grab the top-most pyramid level image ? > > Thanks, > Ronan > > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
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