Compression of very large images

Hi group

If I have a satelit image and I want to compress it, what is
the best way to do it? I know allmost all the important compressions:
ECW, JPEG2000, Mr. Sid. I even tried PWCM, with good result but it took
8 hours to compress. The problem is that it took almost the same time
to decrompress. Can I have the same compression ratio with much faster
decompression time? Compression speed is not an issue.

thanks for your help.

.

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