Hello Dave,

> I think you correctly recognized that you need to round rather than
> truncate the result, but you only rounded one term instead of the total:
>
> Original:
>       filt = filt + (new - filt) / 2;
>
> Rounded:
>       filt = ((filt*2 + (new*2 - filt*2) / 2) + 1) / 2;
>       filt = ((254*2 + (255*2 - 254*2) / 2) + 1) / 2;
>       filt = ((508 + (510 - 508) / 2) + 1) / 2;
>       filt = ((508 + 2 / 2) + 1) / 2;
>       filt = (509 + 1) / 2;
>       filt = 510 / 2;
>       filt = 255;

    you are right! Dumb me...

    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:

    filt = ((filt*2 + (new*2 - filt*2) / 2) + 1) / 2;
    filt = ((1*2 + (0*2 - 1*2) / 2) + 1) / 2;
    filt = ((2 + (0 - 2) / 2) + 1) / 2;
    filt = ((2 + (-1)) + 1) / 2;
    filt = (1 + 1) / 2;
    filt = 2 / 2;
    filt = 1;

    Thank you,

    Brusque

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Edson Brusque                 C.I.Tronics Lighting Designers Ltda
Research and Development               Blumenau  -  SC  -  Brazil
Say NO to HTML mail                          www.citronics.com.br
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