On Mon, Sep 3, 2012 at 2:52 PM, j-b-m wrote:
>
> (...)
>
>> Basically, I adjusted the alpha value so that the maximum goes to 256 and
>> not 255, same for weight that should go up to 65536. So in our case - when
>> there is no luma file and alpha is full opacity (255), the mix calculation
>> which
(...)
> Basically, I adjusted the alpha value so that the maximum goes to 256 and
> not 255, same for weight that should go up to 65536. So in our case - when
> there is no luma file and alpha is full opacity (255), the mix calculation
> which is basically:
>
> ( weight * alpha ) >> 8
>
> gives
Hi.
I recently acknowledged Kdenlive issue 2708 (bug in composite transition
opacity):
http://www.kdenlive.org/mantis/view.php?id=2708
Quite surprising, but there really is a problem with alpha calculation (using
the non SSE version).
The problem can be reproduced with the following command:
