Alan Horkan wrote:

From what I can tell ECW (Enhanced Compression Wavelet)  is a lossey
wavelet compression scheme (either that or Extreme Championship Wrestling,
I hate acronyms).  Due to the high compression rates it seems to have
gained some suppport in fields such as GIS (mapping) where images can be
extremely large.

I managed to find a similar questions in the list archives:

There does seem to be a library for ECW support but a bit of searching
suggests it may not be GPL compatible, but maybe proprietary plugins are
possible with the GNU Image Manipulation Program?  (Since photoshop
filters are supported using PSPI I guess they must be possible but I
imagine the gimp developers would not want to encourage more proprietary

You might want to check out Quantum GIS which uses GDAL support for
ECW and JP2 (but I guess not SID) and export an image to another
format such as TIF.

scott s.

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