[Bf-cycles] (un)Premultiplyed render passes

[Adriano Oliveira]

Brecht,

I have tried to reproduce the combining operetions over a rendered
Multilayer EXR in After Effects.
Unfortunatly I got a light black halo.

The combined pass within the same EXR does not have the black halo.

I think that Color passes should also be normalized. Same for AO and Shadow
passes.

Adriano A. Oliveira


2014-02-28 16:55 GMT-03:00 Adriano Oliveira <adriano.ufrb at gmail.com>:

> Got it!
> Thank you.
>
>
> Adriano A. Oliveira
>
>
> 2014-02-28 11:23 GMT-03:00 Brecht Van Lommel <brechtvanlommel at pandora.be>:
>
> If you combine the passes as shown in the graph there will be no halo, the
>> output will already be premultiplied.
>>
>> You would then use the Set Alpha node to give it an alpha channel. (I'm
>> not sure if that is what you mean by "applying" the alpha channel, you
>> should not be multiplying it in anyway, only setting it).
>>
>> Also, black halos are a sign that you have premultiplied when you
>> shouldn't, it's white halos that you see when you forget to premultiply.
>>
>> On Feb 28, 2014 1:10 PM, "Adriano Oliveira" <adriano.ufrb at gmail.com>
>> wrote:
>> >
>> > But as long as color passes are not premultyplied, you will get a black
>> halo when applyig alpha to the final image, don't you?
>> >
>> >
>> > Adriano A. Oliveira
>> >
>> > Livro: http://goo.gl/WtcNX
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>> >
>> >
>> > 2014-02-28 1:14 GMT-03:00 Daniel Salazar - patazstudio.com <
>> zanqdo at gmail.com>:
>> >
>> >> Hi, this is no bug, here's the correct way to recompose the passes
>> >>
>> >>
>> http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Passes#Combining
>> >> Daniel Salazar
>> >> patazstudio.com
>> >>
>> >>
>> >> On Thu, Feb 27, 2014 at 9:41 PM, Adriano Oliveira
>> >> <adriano.ufrb at gmail.com> wrote:
>> >> > BUILD: b5d6f14
>> >> >
>> >> > I don't know if this is a bug or not, but I am rendering dufuse and
>> glossy
>> >> > passes (direct, indirect, color) and I have noticed that some are
>> >> > premultiplied (likre indirect) and others are not (like color).
>> >> >
>> >> > This seams to be inconsistent.
>> >> >
>> >> > Adriano A. Oliveira
>> >> >
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