On Wed, Dec 29, 2010 at 12:26:40AM +0100, Tobias Bieniek wrote:
> Well... I'll try to describe the problem as easy as possible...

<snip - very intersting description of issue>
> So much for the problem, now some possible solutions:

Another proposal:
 Use alpha channels and transparency. Define the -32XXX Value as
transparent. That info should not get lost and not be compressed unless
you flatten the layers. That way you would still get the advantage of
compression. 

Just something that could be explored. 

 - Folken

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