> It is portable.

	Indeed, and this is why I answered to myself that I was wrong.
It's just that I'm so used to softwares writing raw floating-point data
by people who don't even know what is endianness that I was immediatly
suspicious of using floating point in PNG... until I re-read your
message and the bit distribution you proposed.

	As Christoph suggests, that would be quite nice to make it in
the official PNG format, instead of making it a derivative.  That could
go in e.g. libpng-1.3 -- the only drawback is: when would it appear ?
(png and zlib developpers are not particularly fast at releasing new
versions, and I don't know their policies in accepting contributions).

	- NC

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