Brusque --

> Saddly, your solution suffers from a problem I haven't seen when I wrote
> the original post.
>
> The filter don't go from 1 to 0:

Yes, that's rounding for you -- it either biases toward 0 (truncation) or
toward +infinity (adding 0.5 and truncating). If you really need to go all
the way from 0 to 255, then you need something more sophisticated.

"Round to even", as used in some floating-point systems, won't work for
you; you'll still get stuck at 254 at the high end.

One approach would be to "dither" the rounding by simply adding 1 or adding
0 on alternate iterations.

-- Dave Tweed

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