So hung up on wavelets, we are. Internally tiled TIFF with JPEG compression and similarly formatted internal overviews can achieve 10:1 compression rates without noticeable image quality reductions, and as an added bonus can be decompressed a heck of a lot faster than wavelet-based formats. The wavelet stuff is k00l, in that there is no need for an overview pyramid (it's implicit in the compression math) and much higher compression rates can be achieved. But operationally, you can go a long way with the more primitive (open image format + open compression algorithm) approach.
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