[Kdenlive-devel] vignetting

[Simon A. Eugster]

On 10/31/2011 04:22 AM, Dan Dennedy wrote:
> On Sun, Oct 30, 2011 at 5:36 PM, Alexandre Prokoudine
> <alexandre.prokoudine at gmail.com>  wrote:
>> Hi,
>>
>> Is there any real reason to have two vignetting effects? If we do,
>> could they have some more distinctive names please?
>
> Only people with very new (unreleased) versions of frei0r will have
> the newer one, which was added July. It is part of the deal with
> plugins that there can be overlap, but sometimes we do blacklist one
> when it seems pretty safe. I do not know which is nicer, but old
> vignette ("Vignette Effect") operates in Y'CbCr and has more options
> while frei0r operates in RGB.

The reason why I wrote a new Vignetting effect is that the old one uses 
a gaussian (afair) and has very limited smoothness, and the new one uses 
a cos⁴ which is very close to the real vignetting created by lenses 
(also called Natural Vignetting).

Simon