[gdal-dev] ECW lossless JPEG 2000 compression issue

[Jeremy Palmer]

Hi Devs,

I'm using the GDAL ECW plugin with the ECW 3.3 SDK (2006-09-06) on windows and LINUX. I have built the ECW lib and GDAL plugin from source and have applied all the suggested patches from here:

http://trac.osgeo.org/gdal/wiki/ECW

However I'm getting quality issues with when reading lossless JPEG 2000 compression files. The images seem over compressed in places...

There is some mention of the ECW 3.3 release fixing a bug in the lossless JPEG 2000 compression, where previously a tiny fraction of pixels would be
compressed with a value +/-1 with respect to the input:

http://osgeo-org.1560.x6.nabble.com/ECW-JPEG-2000-SDK-v3-3-News-Update-td3774896.html

Has anyone else had issues when reading lossless JPEG 2000 files in the 3.3 SDK? Have I got all of the patches applied?

Cheers,
Jeremy

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