Mathieu, 21 Aug you wrote to me:
 MB>> i'd rather do:
 MB>> x=(x+128)/256
 EW> That's OK for signed values, not for unsigned's.
 MB> eeegegeeeeehhhh???
 MB> explain please. afaik, my method works for both signed &
 MB> unsigned. 
Thinking about it (I knew I had forgotten something ;-)), it is also 
dangerous for signed values. 
32767 + 128 == -32641, resulting in -127, not really close to 127.99609375.
OTOH using 32bit arithmetic, there's no problem.
Bye,
 Erik 
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