[vorbis-dev] ogg pic format (again).. here's why

Gregory Maxwell greg at linuxpower.cx
Sat Jan 27 10:24:25 PST 2001

On Sat, Jan 27, 2001 at 10:09:20AM +0100, Lourens Veen wrote:
> ISTR integer wavelets being lossless, but ofcourse they're little use
> unless the wavelet coefficients compress better than the raw data, since
> you can't throw away any coefficients. 1:100 is difficult even with a
> lossy codec, so I don't know if that's currently possible losslessly. On
> the other hand, you can't aim too high :)

It is useful to use lossless wavelet transforms for lossless compression.
The transform can expose more redundancy to the entropy coder.

Witness the use of DCT for lossless compression of 3d medical images.

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