In earlier posts I mentioned work was being done to support the latest ECW SDKs in GDAL (see this link). That work is now complete and developers are using the tools. The v4.1 ECW/JP2 SDK has higher performance for both ECW and JP2 data and supports transparency.
Verison 4.2 of the ERDAS ECW/JP2 SDK will be released soon. It contains a few fixes and introduces VC10 development support. GDAL is ready to support v4.2 when it is released.
Do remember, you must get a product license to use the ECW SDK with GDAL. Here is the product page: http://www.erdas.com/products/ERDASECWJPEG2000SDK/Details.aspx
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